Ducting Do's and Dont's for Vent A Hoods - Kitchenfoundry.com

Self help video on ducting your Vent a hood kitchen ventilation unit. Courtesy of Ventahoodparts.com The online store for all your vent a hood replacement parts. online store - kitchenfoundry.com. You tube removed all of our annotation in this video a year ago, I want to add that metal tape can be used for the exterior of your pipe connections and will outlast duct tape. Ducting dos and dont's part two video now availalble here • Ducting Dos and Dont's...

[@barryswanson2818]

This is by far the best video I’ve watched on venting!!!

[@rmontana3693]

My contractor is smart. He used a coiled flexible hose and closed the walls even though I asked for a solid straight steel duct. I turned on my $1,000 range full blast, lit a match, blew it out and watched the smoke not get drawn in. When I asked him what he did he was honest and told me he did not do what I asked because his way works just fine.

[@Txepetxcc]

I hope he never got the maney for that work. That's the only way they learn

[@MuzixMaker]

Lawsuit

[@Lexlugr]

what a guy. This is the only video folks need for ducting.

[@caseyhartman7094]

I like that you included roof cap vents. My home has a "goose neck" style vent for the kitchen exhaust vent.

[@terryleblanc6868]

Just came back fromThe Big box store, the lady employee did not know what a duct was.. oh ,you mean the pipe... Thank you for giving me the information I needed.. my 6-in round was reduced to 4 in flex with a 3-in exhaust port.

[@mvred100]

Erik, great explaining and demonstration on how to repair and clean the Ventahood. It seems the electrical contractors damaged the Left fan wheel (10 years ago) when they built our house, so it has been making a loud noise (wheel banging against the grease catch) anytime we turn on the fan. After 10 years of listening to the fan wheel banging, I finally watch your videos and made the repair myself. Thank you!

[@annshr9917]

Amazing, thank you so much. Just the information I need to know now before I install our new range hood that requires 8” ducting.

[@JudgeBuster]

One significant component never mentioned in this video is installing a spring activated, rubber sealed damper vent above the range hood exhaust in residential homes. They are usually installed in the cabinet above the stove & most are 8 inch diameter. The importance of the damper (not the plastic flaps shown here) is that when the exhaust fan is turned off the damper closes. This prevents both heat & cold AC air from flowing freely out through the exterior roof or wall vent cap during the winter & summer months & greatly reduces energy loss. When you turn the fan on, the light tension springs allow the damper to open & then close, sealing the exhaust vent when the fan is off. Just look up the thermal image videos on YT showing how much heat & cold air escape through the kitchen range exhaust fan roof vent or housing. The lower or higher exterior air temperature literally Sucks the air out through the range hood ductwork. Gravity flaps as seen here get caked with grease over time and stick open and are the very worst type of damper to use. Installing an 8 inch spring damper with rubber seals is very easy if the ductwork is accessible thru the kitchen cabinet above the range hood, as seen in most homes. Installing this type of damper can greatly reduce your electric & gas bills year round

[@erikbergstrom451]

You will find that vent a hood offers an assortment of roof jacks and wall louvers that feature there own gravity closing flap. The flap on the exterior of the house is the one that's intended to seal your home from the loss of ac and heat for customers that have this concern. These internal flaps serve other purposes including preventing blowback when operating only one blower on a ventilation hood equipped with duel blowers.

[@Mixdplate]

We did install one of those spring activated sealed dampers (twice). Mainly because, even though we installed a quality goose neck roof vent with gravity flap, we were able to hear all the outside noises; mowers, neighbors playing in pool, music, air crafts, etc., coming down the duct. We installed one of those sealed dampers into the duct above the above the hood to duct connection. Before completely re-stalling the the hood, we decided to test it out. The damper was great for sounds but when we turned the vent on the damper only opened partially, even at full strength. After troubleshooting with customer service rotating the damper to different positions, was deemed defective. Keep in mind, each time we had to turn it, we had to remove/replace the vent hood! After the replacement came and was installed, the same thing happened. All I could think, was how many people inserted these dampers and then installed their hood, without verifying the damper worked. Waste of money and time!

[@JudgeBuster]

The problem you say that you had is the result of insufficient air pressure from the range hood fan. This can be easily remedied by simple replacing the fan blade itself with a fan blade that has a steeper angle of the individual fan blades. The steeper angle creates higher air flow because the sharp blade angle will cause that. You see this demonstrated on high volume home fans or swamp fans that have the sharper pitch. The problem with most newer range hoods is simply low pitch fan blades that run quieter. These replacement blades are cheap to buy and install since the motor drive shaft for the fan on most range hoods is standard, around 3-4 millimeters. This fix-it trick is usually known by only experienced tradesmen, either HVAC or general home repairs. Sorry to inform you but you do NOT have to remove the range hood assembly to check to see if the fan is supplying enough air pressure to open the louvers on the spring loaded damper. To see if the fan has good enough blade pitch, all you have to do is remove the grease filter from the range hood and then use a flashlight to look up at the running fan & see if the damper louvers are opening sufficiently. They do NOT have to open anymore than 25 to 30 degree angles. They don't even have to open at 45 degrees angles to allow for sufficient evacuation of air below the range hood. To find the replacement fan blades for range hoods you would search for "range hood replacement fan blades". You'll see all kinds of blades with the sharper angle for increased air flow & increased air pressure to open the damper louvers. Hope this helps enlighten you

[@Mixdplate]

@@JudgeBusterGood info on the blades! Sure would have been nice to have been informed on this during troubleshooting. We only removed the hood when we had to reset or remove the damper. The testing was done as you stated with hood in tact, looking up thru the fan. Thanks for the info, I since sold that home and currently looking to install a hood in current home. Feel better armed with more helpful info!

[@craigmiddleton6048]

Exactly what I was looking for. Crisp and comprehensive. Thanks Erik.

[@fiercemann86]

Very great demonstration Erik, probably the best on youtube. I like that you give detalis and reasonings of why and why not. Can you make videos of an average US household ducting, starting from the unit, trunk, fitting, transitions, and ending on the vent cover? :)

[@jjjohn5914]

Thank you Erik....I renovated a 350 yr old barn...Kitchen took me 18 months alone...26× 26...used a Best fan and internal damper/flaps rattle...Have not been able to resolve the problem.

[@erikbergstrom451]

I would suggest reaching out to purcell murray who distributes best products. They will be the warranty agent and can troubleshoot the issue best on there internal flaps. Here is how you locate them www.purcellmurray.com/company/distribution/

[@jjjohn5914]

@@erikbergstrom451 thanks for your suggestion Erik.

[@mikemcardle7466]

A true tradesman :-) Thank you for sharing your expertise :-)

[@RBXXXX]

Thank you! Because we have I'm running mine on the side upper wall of my house. So your video is very helpful.

[@carluvr1000]

Really great information. It answered several questions I had. Thank you for posting.

[@Fortcraft_yeet]

Very easy to understand why to use the right size ducts save me a bunch of mess ups

[@erikthevikingbergstromtada6767]

Your videos are so helpful! Thank you so much for posting them!

[@chummilian]

working on my own home, and want things done right! Extremely helpful!

[@lukesui]

Thanks for your detailed demonstration. Make a lot sense!

[@erikbergstrom451]

I want to clarify that we caution against square pipe when hard turns are used that impact the speed of the exhausting air. The manufacturer does make a venting transition model number vp561 that can be used to convert the 8 inch round to a 6 by 8 1/2 inch square using a gradient 45 degree angle. When using this transition it will turn the air very quickly and this can increase the overall sound volume of moving air in my experience. The fewer turns made in the duct run keeps the sound of moving air to a minimum. The duct pipe can be converted to square when space is limited and if this conversion is required, we would like to see a gradient turn as oppose to a hard 90.

[@thebarcodeguy4420]

+erik bergstrom Great video. Near the start of the video you mention "circumference " when I think you meant the "area" of the 8 inch duct should not be reduced ( Pi R squared) As apposed to 2 Pi R) Great video. Things like this make me want to buy your products over your competitors. Are they made in America?

[@erikbergstrom451]

+The Barcode Guy Hello and thanks for writing, Vent a hood is manufactured in Richardson Texas

[@JPPersson777]

Best video so far ! Thanks for all the explanations.

[@danielhuynh01]

Thank you for taking the time to make this video sir, it's very helpful.

[@richardshort4587]

Great video thank you. But most of these videos all seem to miss one major important thing. And that is insulation from outside temperature. Here in Alberta Canada, like many other parts of the world suffer temps down to minus 40C Vent pipelines for clothes dryers and other vents all ice up if not insulated. With many homes still having only 4” thick outer walls that cold will easily follow the vent piping into the home. So could you address, and show us how to properly insulate a wall outlet style vent all the way back to the hood connection in a chimney style range hood. Thank you. 🍻 PS: Just remembered another thing and that is makeup air supply for the higher cfm hoods. 👍

[@SteveSapienza]

Super helpful info - thanks! Helped me avoid several mistakes.

[@alecstahl2387]

Very good explanation. You speak very well and clear, too.

[@michaelcao2711]

Really great information. Thanks for your detailed demonstration!

[@bobhayes8248]

Very informative, Very good info. Very good Instructor. Great job

[@omarelghetrify215]

Very helpful video, thank you! Part 1 and 2 are great.

[@HomeSweetHomeIdeas]

Okay, not the video I was searching for. Buy, very informative and interesting... Thanks for the great detail.

[@oliverjed]

Very helpful information video. Thank you for all of the great tips!

[@HLTodd]

Terrific video with lots of really helpful information.

[@ngamac]

Great video! It describes many dumb things that the team did when they installed my unsuable hood... and confirms my plan to fix it! I'm wondering: what kind of sound dampening could be used between the pipe and a big surround cover (think hood surface all the way to the ceiling). The hoods was so loud... surely because of the flex pipe used that I'm replacing. but I'm guessing that the vibration in that big box might also create quite a bit of noise. Thanks!

[@pnut1332]

Excellent video, very detailed and informative. Thank You

[@andzz1731]

That was so informative Like the product information Will definitely be looking to purchase your product Thanks

[@leo6princess]

Thank you, very informative and useful information.

[@robertbolin8942]

Great advice. Thanks Erik.

[@halfinchholes88]

So if I remove the damper flap, I should be able to run the smaller pipe? Just kidding, installing a 3 fan vent-a-hood this weekend. Utilizing VAH 8" & 6" into one 10". Gonna cap with 10" Air King cap. Should blow my cooking aromas at the neighbors! Thanks for the info! Scott

[@manuelquezada185]

Great video really explained everything I needed to know for my install of my new vent

[@irecycleable]

Excellent demonstration ! You should list your web site so we can purchase are range hood. Also installation video will be helpful keep up the good work God Bless!!

[@TomWilson8003]

Excellent demonstration and instructions. I'm having a twin 48" installed in a new home. The HVAC guys didn't want to run straight up to the roof because its very high and they were concerned about condensation. It will vent to a back patio with one 90 degree elbow. Should I be concerned about odors or noise on the patio?

[@mikep.6271]

Eric, thanks for doing this video; a lot of great information and you talked me right out of doing it myself. I could, but I'm short on time and I'd rather have someone like yourself do it who knows much better than what they're doing. What kind of contractor should I search for who can do this level of work? An HVAC company, or appliance installation or what? Not sure what to look for. Thanks again!

[@erikbergstrom451]

I would call the distributor of the product in your region of the country and ask them for a list of recommended installers . For a list of vent a hood distributors click here www.ventahood.com/index.php/support/parts-service they will likely have a list of appliance installers servicing your state

[@restart1060]

Very well explained

[@TheFinleyHouse]

Thanks for the very detailed video. Very helpful!

[@kennydieu2694]

Great video and thanks for sharing .

[@SIRHAPPS]

thank you for sharing your knowledge

[@yeahitworks]

good video actually, very informative, compared to other youtube videos here.

[@dougpeters1625]

A lot of good tips here!

[@victorvek5227]

Hey Eric, I know you stated you don’t like spring-loaded backdraft dampers because they create a negative pressure. But the gravity dampers make a terrible racket with wind and provide insufficient backdraft reduction. Do you use / know of any inline backdraft dampers that are ideal? I’ve read mixed reviews on Tamarack’s inline cape backdraft damper. I really don’t want the noise of a steel damper hitting in the wind.

[@erikbergstrom451]

I have had customers add a gasket strip to there backdraft door to dampen any opening and closing sounds/. I do not have any experience with inline dampers, good or bad. If you do put in a section of ducting that includes dampers I would place it in the attic where it can be accessed . Once the backdraft dampers have years of grease on them they stop opening and closing as well. I would want to be able to access it to service the parts and dampers if you choose that system .

[@bakheetalzahrani2498]

Thanks

[@CNEpornstar]

Very helpful and informative. Thank you.

[@hanjoni]

Wow very informative video. Great Job!

[@JonDunnmusician]

nice job Erik

[@jedichenbin]

Very helpful video. Thanks mate!

[@gta3ist]

I learned a lot from this video but wouldn’t regular duct tape break down over time Or are both of them rolls metal tape ?

[@Street-Shred82]

I live in the midwest where we regularly get cold winters. Is it necessary to insulate the duct work running through the attic and out the roof as to prevent condensation?

[@erikbergstrom451]

In California we do not have this requirement.Building codes can vary depending on your region and I recommend reaching out to a local inspector to determine your cities requirements

[@newmanfertig886]

Forget a roof cap dog, going out the side

[@rafishaheenian2468]

Excellent presentation/demo. I'm about to install a range hood with 3.25x10 rectangular opening with an adpter to use a 6" round opening. Will using the adapter cause a lot of degradation in performance? Also, the cieling opening is a 5.75 square hole. Can you please let me know if I should go a head with this type of installation? Thank you very much.

[@Jay_Rule]

What if the range hood adapter is smaller than the existing kitchen ducting?

[@JerseyRepresenting]

thank you for the tips

[@travelervic7791]

With the flexible pipe , you can bend it and create a cold air trap to the outside. With straight rigid pipe you can not. Just curious if you ever used cold air traps, or if there is one made for rigid pipes. Thanks.

[@dondrysdale9480]

What about bats getting into the vent through the T Cap

[@wasabij]

wire mesh cover.

[@vangstr]

Thanks. Very informative.

[@lookie-lo9oy]

Hi Eric, I had the exiting 7" duct pipe in the wall , my new range hood come with 6", can I able to use the reducer from 6" out to 7". Thank for the great video

[@erikbergstrom451]

Its ok to go larger with the pipe size

[@RISHIRAJ-xc7tu]

Pl advise best software or manuals Round / circular process duct calculation including, Expansion joint, Stiffner, development, pressure drop, Load calculation on each support

[@NMranchhand]

Really an outstanding sharing of your expertise. Thanks very much. A question of expertise on elbows: suppose you had a question of running 3 feet up to an elbow and then 4 feet out to an outside wall versus seven feet straight up to a roof exit, how much restriction to flow do you suppose the elbow would give to the first seven-foot run over the second elbow-less seven-foot run?

[@bobbygerber2764]

The unit is rated to make a turn in the duct pipe without impacting its power rating,. You will only get into an issue running to many elbows back to back . The unit may run slightly quieter with a straight duct run. This would be the onlt difference between those two scenraios

[@NMranchhand]

Bobby Gerber Oh, super, that settles my installation. Your presentation and kind response have been enormously helpful. Thanks again.

[@patriciaterranova1074]

Great info

[@TheRobertralph]

Great video. Thanks!

[@timwashington824]

THAT WAS GREAT CHIEF!!!

[@Oneuv7]

Thanks, Eric! Perhaps our situation is not so unique. I haven’t found any information online similar to our project. We are rehabbing a 100 yr old house and decided to update the kitchen. The house at 1330 sq ft has been a fun challenge. We decided to install the gas cooktop right next to its original fireplace chimney. The cabinet above the stove will house the blower. I don’t think we need a hood since we have the cabinet. What vent should we start looking at? And how can we install the most efficient, safe and cost effective way possible. There will 2 right angles - one from vent to fireplace then another to final duct to roof. Or should we just install one and use chimney as duct?

[@erikbergstrom451]

Hello - it sounds like a very challenging rehab. Its hard to get a perfect visual based on this message. There are a few suggestions I can send your way. In los angeles county california and surrounding regions where I live, it is against fire code to vent a cootop into a chimney. For this reason it doesnt pass code from the city inspector, and if they house burned down from a related issue your homeowners insurance likely not cover the damage. I would check with the city inspector in your region to determine if there is any acceptable safe way to go about this. Here is california we are unable. The cabinet above your cooktop should have a metal hood liner inserted inside. If its a wooden cabinet with a blower inside that would would be susceptible to damage from the heat a cooktop generates and would not pass code . Custom vent a hood liners can be fabricated to fit the cabinet above your cooktop/ Contact your vent a hood distributor for instructions on how to get a site servey that involves a sales rep coming to your home and drawing up a quote for a vent a hood line to fit in your existing cabinet/. www.ventahood.com/index.php/support/parts-service

[@leeketcham6738]

Great video. If I need to vent right out the exterior wall with 8' ceilings and my hood has a 6" exhaust. Can I use 6" to 8" duct "enlarger" and then use your 8" backvent elbow? I think I would have room for both pieces.

[@erikbergstrom451]

You can always increase the diameter of the pipe without effecting performance. You can use a 6 to 8 inch enlarger.

[@alessandromorelli9412]

thank you! great tips!

[@tonepoet4568]

Fantastic demo. My range hood is 7 inches! No gravity opening plastic flaps. Can I find reducers to connect to a smaller vent pipe?

[@erikbergstrom451]

although we dont recommend using reducers they can be found on the web from various suppliers. home depot will likely carry a variety of them as well

[@edwardalamo2507]

Most are 90 degree exhaust

[@tiffanywilson3709]

We purchased a home where a flexible duct was installed out of the range hood to the roof. Can we replace with a rigid duct from the vent hood to the cabinet top and leave the rest of the duct flexible or should we replace the entire duct (which will be pretty costly)?

[@Street-Shred82]

How about the direction of the duct work in relation to the smaller end(male end) vs big end(female end) of the piping. Considering the direction of airflow, would it hurt anything if the pipe coming from your range is fitting around the outside of the following pipe as opposed to fitting inside? I was doing my ductwork for my range hood and started working from the roof cap, on down to the range. I used a connector underneath my roof cap prior to installation to make it easier to connect the ductwork, but the connector had the smaller corrugated end on both sides which had me working backwards so to speak. So starting at the roof cap, everything fits INTO the next piece of ductwork working down to the range as opposed to fitting OUTSIDE of eachother. Was curious if this is enough to disrupt airflow to a noticeable degree or not.

[@erikbergstrom451]

I go into more detail about the collar direction in this video kzbin.info/www/bejne/l2q8e2SZjsmXjLM basically just creates little air pockets that can make the hood sound a bit louder . You can always go back with high heat metal tape and tape around each joint from the inside smoothing those air pockets so they dont make noise .

[@joevalles1963]

Great information! Just built a home where it's windy. We installed Zephyr double motor/fan vent hood. We hear mega volume of wind blowing through the ducting and stressing me out. We have been experimenting with candy cane venting and wind caps to resolve impact of the wind. Any thoughts and or suggestions?

[@erikbergstrom451]

You can find roof caps with gravity closing dampers. I know vent a hood makes them. I would suggest a cap with a closing damper in this scenario

[@billtran5334]

Professional. Thanks a lot

[@TubesWidener]

Thank you

[@fransferreira8307]

Exactly the opposite of what the salesman tells you

[@WizOWash]

I'm looking to install a 54" ventahood for my 48" range. the problem is that my ceiling is only 96" leaving me with little to no room to connect the vents to the external ducting. is there any way for me to do this other than lowering the hood i.e. making the distance between stovetop and hood less than 30"? thanks for the video

[@laurelglenn]

Thank you very good video

[@lesleeblu9381]

This is great information! The previous owner of my home installed a microwave above my range that recirculates the air though the kitchen/house...HATE IT. I do not see any duct work, but I want to get a REAL exhaust system. Any recommendations on where I should start? Thanks so much!

[@erikbergstrom451]

stores.ebay.com/Kitchen-Foundry

[@Patricia-lts]

Excelent video

[@ronh9384]

A good explanation Erik. I have a different situation though and hope you can help. My gas stove is on an interior wall. I am currently using a microwave venting inside. It is too loud and does not have enough speed selections. Is it possible to switch over to a vent hood and run the ducting down the interior wall and under the kitchen floor and use a remote vent fan in the basement and then vent it through an exterior wall about three to four feet off the ground. They would only be two 90 degree articulating elbows and there would be about 7 feet between the elbows. Can this be done and Is that legal? Any information/assistance you can provide would be greatly appreciated. Thank you for doing a detailed video with way more information than any other video I’ve seen. Thanks. Ron

[@erikbergstrom451]

Hello, The products I sell are not designed to be vented downward. There are products on the market such as downdraft systems that where created to exhaust air downward. Elica Aspire Series ERS636S1, You should know that these systems would not outperform having a canopy above your stove with a duct to the exterior wall. For some situations its the best option depending on limitation in the home to duct upward . PM me for information on reaching a rep for Elica

[@eric6201]

Great information. My vent a hood vents out the wall and is allowing cold air into my home. Any suggestions?

[@erikbergstrom451]

Vent a hoods have internal flaps, and flaps on the wall louver. Unless there are heavy winds blowing the flaps open the cold air should be limited. You could tape a small weight to your flap if the wind is blowing it open.

[@halodave]

I have a current square duct installed through the roof but bought a hood that takes a round one. Doing a complete kitchen remodel. I also need to move it 3 feet to the right. Do you sell conversion kits? What’s the best way to do this?

[@DBVintage]

Great video but I have a question. You mentioned that when there is a restriction that you can't hear the difference between low and high speeds. Is this correct?

[@erikbergstrom451]

There are many factors that can cause this issue/. A severe restriction would cause this and also a stuck flap. Please see my video kzbin.info/www/bejne/qqibgnigmtyfibc

[@DBVintage]

@@erikbergstrom451 Thanks for quick reply.

[@FrancisGraffeo]

You clearly know what you are talking about. Great video! I'm about to install a model with a rear vent. It has an 8-inch duct flange. My problem is that I need to install a 90-degree elbow horizontally immediately after it passes through the kitchen wall (and then 5 ft. to an outside wall). That elbow will be only 5 or six inches from the back of the unit. That's shorter than recommended. Would it help at all if I transitioned to a 10-inch duct straight out the back before the elbow and ran 10-inch duct the whole way? In either case, what problems are created with an elbow so close to the exhaust port? If it diminishes efficiency, how much air flow is reduced? Also, is it a safety issue? Thanks for your knowledge!

[@erikbergstrom451]

I am unsure what brand product you are working with on this job, and all the hoods on the market can have different ducting parameters. With the vent a hood product you can put a 90 right off the top or the back of the ventilation hood. The first 90 does not need to have 5 feet of straight pipe involved between the hood and the first turn/. For this 90 you are fine. We also advise that the vent pipe can always go larger in size . If you choose to go from the 8 to a 10 inch it will perform well.

[@caribouwho]

Comprehensive. Thx.

[@NassauSlim]

Hi Eric. We just had a contractor install a new range hood (900 CFM rating) with 8 inch ducts. The problem is, when he cut through the sheet rock to install the 8 inch wall cap on the side of the house, he discovered it wouldn't fit. There was a load bearing stud on one side of the hole and pipes on the other side - leaving less than 8 inches clearance. He is now telling us that in order to make it fit, we need to install an adapter connecting to a 6 inch wall cap. After watching your video, I'm wondering - how much (if at all) will this "ducting reduction" affect the CFM performance of the hood? Thanks for your help.

[@erikbergstrom451]

We currently sell a single motor 300 CFM unit that requires a 6 inch diameter duct pipe. When you reduce the vent pipe from 8 inch to 6 inch you could experience as much a 50 percent reduction in performance.

[@teoabroad]

@@erikbergstrom451 50% indeed? Isn't it too much loss?

[@jasonvanhoose7259]

Great info Eric! I’ve just installed a new 1200 cfm vent hood that has a 10 inch outlet, and want to find a roof exhaust that will fit. I don’t want to reduce down to 8 inch, but finding a 10 inch is proving difficult. I’ve looked locally for a T-Top and can’t find one. Do you have a source you trust?

[@erikbergstrom451]

The brand vent a hood makes a ten inch outlet, its available at ventahoodparts.com you can also call the manufacturer of your hood and inquire if the make a roof cap. In the case of the t top, you'd be going to a sheet metal fabrication company. These types opf supplier make vent pipe for hvac guys and will make up products from sheet metal such as the t top - they would also make the flange of the roof cap match the pitch of your roof

[@caroliguori]

Thank you for the video. We just finished installing a blue start range hood and used flex pipe. This was a very difficult installation and the pipe bend on one side just a little. The ventilation is very good but I was just wondering if having the small bent on the pipe is a big deal; It bend because once compressed, the wall is double with a big space in between and the pipe goes in an angle from the inside hole to the outside hole. I can hear the difference in speeds but in reality I would like to make sure it is perfectly installed. Any advised?

[@erikbergstrom451]

In many areas, Including California , its against code. many installer will use it since its easier then getting a flat wall custom transition made. In very short lengths it wont hurt your performance unless the pipe is doing back to back 90 degree turns. It tends to make the sound of the moving air louder,.. These are the only drawbacks I know of

[@MrAquinas1]

Don't they make adapters with a tapered progressive shape that would not cause the blockage you're talking about?

[@bobbygerber2764]

We imagine this like water traveling around a kink in the hoseline. The water behind the kink begins to back up and only a certain amount of water can make it through the kink. There are no adapters or tapered reducers that will address the performance loss. If less air can make it through the reducer the hood will have some performance loss.

[@moondog573]

what stops outside air from entering the home when the hood vent isnt on? or what stops air conditioned air from escaping the home when the vent isnt on?

[@erikbergstrom451]

The vent a hood product line comes with a set of dampers within the hood. We welcome customers to use a wall jack or roof jack with a secondary set of flaps if you choose.

[@hijinks21]

I take it you should never vent downwards? Trying to replace a down draft oven

[@erikbergstrom451]

With the vent a hood product we do not advise turning the exhausting air downward. There are other items on the market that promote downdraft systems. Studies have shown that in a best case scenario a downdraft system can only capture a fraction of the smoke and rising vapors from the stovetop.

[@VenusElectricRecords]

Your mind would be blown (or perhaps not) if you saw the job (if you can even call it that) that I am replacing on the home I bought..... 45 degree elbows were the wrong size for the tube and no attempt was even made to even attach them!! So there is a 1" gap all around the elbow... and then at the other end the pipe is also just resting (completely unattached) inside a (painted, wooden) side louver vent box inside the attic space. Is it even ok to utilize the side louver? I'm in N California, whereabouts are you guys based?

[@erikbergstrom451]

I can believe that having driven all over Los Angeles looking at bad installations for years. Im sure that contaminants have been escaping into the attic space and very little of the exhaust was reaching the outside. you may be able to re use the louver if the opening to the outside is equivalent to the square inches of the pipe. you can contact the northern California distributor to get leads on authorized installers serving your area. There number is [phone]

[@Meltingfaces]

Oh yeah. same here. I have a house from 1920 and the shortcuts the people who owned it before me are insanely bad. Bathroom vent exhausts into the attic, wiring is all connected across breakers, and when they last worked on the plumbing they left the old steel pipe (which I have to replace due to its inward corrosion).

[@iRideUCF08]

Very informative and helpful in understanding venting. Question - part of the 8” diameter directly inside the hood is reduced by the interior structure of the hood. What’s the reduction in CFM? surely there is edge effects of additional turbulence resulting in peak performance loss / additional noise?

[@erikbergstrom451]

The tests performed to rate the cfm where done at the exit point of the exhaust run. For this reason the turns the air makes as it enters the hood and turnes into the vent pipe do not reduce the rated cfm for the product. Additional reductions within the duct run would cause a loss of cfm/.

[@sticktoyourdrums8177]

I’m curious on how to vent a range that butts up against and interior wall with a second floor above. If I vent my range the standard way, it would put the vent in the garage. Do I have to run duct work in the garage out the back or is the other options?

[@erikbergstrom451]

I understand that going through the second floor is not an option. In this scenario Id be looking at venting through the garage to an outside wall. Or you would be need to consider the re-circulation hood options

[@NYOB52]

Do you have tips on what questions to ask a HVAC contractor when searching for one to install the ventilation? I am in the process of finding someone to drill a hole through my roof or a side wall. Thank you!

[@erikbergstrom451]

The best tip would be to have them watch this video and my other videos in this collection

[@ernestelizondo3033]

my concern is the insulation caching fire, with the heat of the duck work in the wall.we cook a lot. should I be concerned?

[@erikbergstrom451]

+Ernest Elizondo The duct pipe doesn't get very hot. Vent pipe normally passes through insulation as it travels into the attic space and this isn't anything to be concerned about. When you are venting an oven you would use double walled pipe, however you do not use double walled pipe with a ventilation hood since it does not reach those temperatures.

[@ZLINEKitchen]

Great video! Very educational, let us know if you would like a ZLINE hood for your videos!

[@emilyp143]

I just bought a ZLine insert hood and it came with flexible ducting. Why? It is against code in most areas and it creates more noise etc.

[@ZLINEKitchen]

@@emilyp143 Hey Emily. All of our range hoods and parts are ETL certified so they're tested and safe. The flex ducting is a complimentary part and is not required for the range hood to work. If for some reason the ducting is against your local code you should be able to purchase metal ducting from your local hardware store. Let us know if you have any questions.