How to Size Ductwork?

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The FULL Video How to size Ductwork
• How to Size Ductwork?
The full video is about 30 minutes long packed full of answers to all your questions on sizing ductwork.
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#ductsizing #ductwork #hvac

[@shemardavis8735]

Thank you for all that do you for us Hvac guys. You are truly a blessing. Keep up the good work.

[@TaddyDigest]

Your welcome my brother I am here to help

[@Caesar-nq5if]

Priceless information for a guy like me....

[@garygowan4134]

Selling hvac info like a true drug dealer 😆🤑 give them a taste and then tell us if we want more it will cost you....I love this channel!!

[@TaddyDigest]

Oh yeah

[@dialac1]

Thanks for the free video. Glad your members get to see the most important stuff. Just know that on my iPad, there is no way to join and be a member. All I see is the subscribe button. And I’m sure most people are in the same boat who click a video only to find out that the main info is behind a paywall that they can’t get to.

[@TaddyDigest]

Hey thank you so much for this information I had no idea I wish there was a way around that I know there are so many people that need my content but they are not able to see One day I hope to be able to give it away for free

[@OneLeggedTarantula]

someone related to flow.. was redoing the ductwork in an older home that had a newer furnace/ac. I asked the tech to clean the coil while we had the unit disconnected and when he pulled it out, to my surprise we found the installation manual laying there right on top of the coil, blocking flow. Guys, always check the new unit and remove foreign paperwork! That 8.5x11 manual had been there for a few years!

[@abazism]

Thank you so much. You explained it very well, and easy to understand. Please make more videos

[@TaddyDigest]

Thank you, I will

[@safespaces3644]

Hey that's awesome! I was like #300 I should get a free hat or something 🤔 love the videos man! I know your doing the fellow hvac man a lot of good service by this video. I personally learn better through videos rather than reading books, thanks for being that somebody who is teaching this way

[@TaddyDigest]

Awesome thank you! So Glad you are here Stay Healthy Stay Happy Become a member check out the Full Video

[@leoneugene7456]

Awesome Ted good work buddy thank you.

[@TaddyDigest]

No problem 👍

[@Davidandgoliathhvac]

Great content!

[@jamesdeanvegas]

Great video

[@TaddyDigest]

Glad you enjoyed it

[@367scotty]

great video.

[@TaddyDigest]

Glad you enjoyed it

[@ChrisDembinsky]

Can you make a video that compares a few common flex duct brands. Maybe include what can be found at big box stores vs HAVC supply houses.

[@ChrisDembinsky]

For example, a large house(3300sqft) worth of flex is $2250 in JPL but if I want to use Quietflex it would be $3350. Both R-8 metalized flex from the same supply house. It would be great to know why someone would pay an additional $1100. Quietflex does highlight their “rip-stop” scrim reinforcement. So maybe if there is a location in the attic that likely to get damaged spend the extra for “rip-stop”?

[@joshuacassino7297]

What size should my trunk line be? Also can one boiler control two air handlers?

[@Angel13578]

Thanks!

[@TaddyDigest]

Absolutely you're welcome I'm glad you watch the video

[@Angel13578]

How can I become a member and learn about air flow, supply air return size & hvac and furnace sizes.

[@TaddyDigest]

Hey Thank You so much Here is the Link Sign in and then click the join button kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin Then email me at [e-mail]

[@TaddyDigest]

Become a Level 3 member and gain access to my full videos Members only videos

[@Angel13578]

I don’t see where or how to become a member, you sent me a link but it doesn’t take me no where

[@tayvonbrown1661]

I appreciate this 🙏

[@idaliadorantes4249]

Hey there! Would mind sending me the rest of the video? Thank you

[@TheCcabler79245]

Hello I liked and joined sir.

[@TaddyDigest]

Hey Chris thank you for subscribing

[@wstt4]

How do I know the maximum airflow, CFM, that can be handled by some 6” flex duct I have in my attic, if I put in a booster fan to be able to increase aire flow at certain times? The duct says 4000 FPM maximum, it’s 6” duct and I’ve got about 15’ of duct run before the booster fan and then 15’ after the fan to the vent? The fan at top speed says it puts out 400 CFM. Thanks in advance for any help on this.

[@devindailey8974]

I'm just got my Hvac License in Ga. I familiar with duct sizing. But I want to get much better and use in every job. Whats your recommendation

[@jimoliver5758]

How do you become a member and what is the cost

[@TENNESSEETV.]

Just curious how much does 7inch an 8 inch cfm in the line??

[@trevmint5615]

What about duct length?

[@eddierivera2669]

Hey, I’m a member. Do you have a video on return sizing for a 3 ton unit ?

[@TaddyDigest]

Hey Eddie thank you my brother for joining. If you haven't sent me an email. Here is my email [e-mail] I should have a video on return duck sizing If not I will make one

[@deanburke3041]

Eddie! The biggest possible with filters installed. It has to work.

[@8683roy]

Is there a formula for an air return duct size in relation to the supply size in a small sealed room? In other words I will be supplying a room with 2- 6" ducts. What should the return air size be?

[@bojangles_bonjangles8000]

(2) 6” returns. Or whatever the requirements of cfm are for that room. If not you will have an extremely pressurized room.

[@southside6924]

I got 4 7” and a 8” and 1 5” vent attach to my plenum in a 750 square feet camp is that good r bad? It’s a wide open camp no ceiling

[@biblebloopers946]

I was at a house the other day where my suction pressure seemed a little low and I had 2 degrees of super heat. When I went inside to the furnace to take total external static pressure, it was rated for .5 but I was getting 0.8. I got .27 before my blower and .56 after my heat exchanger. I thought my evaporator coil maybe the problem because I was getting a pressure drop of .3 across it. I got .56 before the coil and .26 after the coil. I chemically cleaned the evaporator coil and even used a hose. That coil is spotless. Nothing changed as far as static pressure. I don't know the rating for that coil for pressure drop because there is no model number that I can find. The outdoor unit was a 5-ton so I'm assuming the evaporator coil was correct since it was the original evap coil since the house was built. So I started looking at duct sizing. I had a 20-in flex duct for my return. It literally 90 right off of the air handler and to the filters. I think I was getting plenty of airflow since my static pressure before the blower was .27 For my Supply I had three 14-in flex ducts and one 6 in flex duct going to some little room. I don't know if I didn't have enough Supply duct but it almost seems like the coil was like a brick wall. I should have pulled one of the 14 inch ducts off and check my static pressure but I don't think that would have changed anything since I was getting 0.26 after the evaporator coil. Anyway, i believe I have sufficient Supply. But I'd like feedback if possible

[@TaddyDigest]

Interesting I will look at my ductulator and figure out what you've got going on

[@TaddyDigest]

Ductulator says 14 inch duct carries 700 cfm so for 3 that would total 2100 cfm which would be plenty for a 5 ton 20 inch duct will carry 1800 cfm

[@biblebloopers946]

@@TaddyDigest thank you

[@TaddyDigest]

You're welcome my friend

[@jdd6447]

@@biblebloopers946 is the txv adjustable and did you try lowering the fan speed? Also check if sensing bulb for txv is properly and securely attached and well insulated. What was your subcool on pressures?

[@corneliusschmitt9408]

Looking at your chart is really helpful, but since I need help with commercial ductwork, the cfm I need isn't on your chart. what do I need for a 24,000 cfm unit?

[@TaddyDigest]

54" round ductwork

[@jayprojects5176]

Thanks for making these kind of videos. I have a 5 ton package unit that I have to install. Can I apply this knowledge to a 5 ton package system as it relates to the duct work I need for it?

[@TaddyDigest]

You're welcome I'm glad you're watching You can definitely apply this to any ton package unit that you're installing

[@felipeballi7679]

very cool man.

[@TaddyDigest]

Thank you very much Felipe

[@alexlindekugel8727]

little confused looking at buying a wood furnace the blower is 1800cfm but yet the out is 2 8 in pipes by the numbers that maybe good for 400 cfm total.... help this doesn't make any since to me.

[@michaelmixon7846]

Question, i have less than 900 square ft home i was given a carrier 3.5 coil with heater blower. i was told that a 3.5 is too big for my home. and i should use a 2.5. i now have a 2.5 condenser by carrier. the house has 2 br,bath, kit, living room and a dinning room off the kit. in the hallway i only have room to access the attice there is no place for a large return. i am told i should put the returns in the ling room and bed room. i am doing the install by myself. what size vents and ducts should i use. i know the coil and condenser don't match. but which is better the coil being bigger or or smaller?

[@TaddyDigest]

Hey Michael you are a member thank you for joining Send me an email at [e-mail]

[@TaddyDigest]

Hey Michael have you seen my duck sizing video

[@johnking1079]

Do the same rules apply to ducted mini-split systems? I vaguely recall reading something about them using higher velocities???

[@TaddyDigest]

Ducted Mini splits are awesome they have a pretty good range of adjustable blower static pressure settings. I have a video on how I changed the static pressure using software

[@TaddyDigest]

I treat them the same though

[@myrtlewright7839]

I have 14 in flex duct running to heat pump but can't find 14 in can I reduce to 12 in flex duct ? If so what all needs to be changed?

[@TaddyDigest]

Did you watch the video? You need to watch the whole video click the join button

[@martypoo8]

Hi I have a 2 ton unit and need a new one but want to go with a 3 ton is that something easy to do I’m almost at 1800 ft.² coverage with four different returns

[@TaddyDigest]

nice Depends on your duct size the amount of supply vents and sizes and insulation value of home

[@RichardT123456789]

Hello, How would you calculate a mobile home split system with an inside down flow air handler 3 ton . No return . The Mobile home is 16X80 single wide with 8 vents total. The original duct is the rectangular sheet metal, and it is degrading.The mobile home is 1999 model . The local supply shops do not have the sheet metal available & I am considering using Flex duct & I am not sure what size or may I even use flex duct in replacing the sheet metal . Thank you

[@TaddyDigest]

Hey Richard great question I need to do a video about trailer units very soon I've been thinking about this for a while I will do a video and I will send you the link when I do it

[@RichardT123456789]

@@TaddyDigest Thank you .

[@Alex-er6xm]

Hello there , I would like to buy the full video , but I don’t want to do monthly payment . Is it possible to buy the full video ?

[@TaddyDigest]

After you subscribe just watch the video write everything down and take notes and then cancel your subscription

[@jeffsond]

I have a unique situation. I’m a DIYer. I have a 440 sq ft hunting cabin. The size may go up to as much as 770 sq ft in the distant future. That being said, I have an electric furnace with a 1.5 ton condenser. The ductwork will be a straight run from one end to the other. It’s 38’ long. Am I fine installing 12”x 8” rectangular ductwork? Thx for any help. I’ll be purchasing ductwork this week

[@TaddyDigest]

kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1w Join and send me an email

[@destroyer.e]

@@TaddyDigestyo how do I join the members only portion of the videos

[@TaddyDigest]

right here my friend Level 3 Join this channel to get access to perks: kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin Wanna Learn more about hvac? Check out my hvac tips for technicians playist. kzbin.info/aero/PLVjetZt5xgenmO76adHwb2ctyeBIFKUus

[@Nobody2day553]

No, you'll have to step the main trunk down at the 24' mark to maintain static pressure. So you'll drop that down a couple inches.

[@tomnguyen7602]

Thank you for your video, I dont understand what mean 8-6" for 2ton- 800cfm?

[@TaddyDigest]

watch my duct Sizing video You will understand after that one let me know if you have questions

[@grittychitty7538]

He means in order for the correct amount of airflow to circulate through the ducts with a 2Ton system you require 8 ducts that are 6” minimum in size. 6” ducts carry 100CFM each. 2Ton = 800CFM = 8 * 6” ducts

[@TaddyDigest]

That's awesome thank you so much for posting this good knowledge and good interpretation

[@biomedlib]

@@grittychitty7538 Are 8 ducts the same as 8 registers? I live in a 2-story house and have a total of 11 registers. Thank you.

[@ramsayzaki]

You never showed us the other side with the return vent size. Looking through your videos I can't figure out which one shows that info.

[@TaddyDigest]

I do a full length video and it's part of my members only level three members can see it

[@JDT738126]

How do know if the fan on the unit will have enough power to move the air? What is a duct system is too long for a fan to move the air effectively?

[@TaddyDigest]

watch the full video it should help answer your questions let me know

[@JDT738126]

@@TaddyDigest couldn't find the link to that video....

[@TaddyDigest]

The video is on my members only playlist. The video is also down in the link in the description

[@destroyer.e]

How do you join??

[@TaddyDigest]

Here is the link to join Join this channel to get access to perks: kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin Wanna Learn more about hvac? Check out my hvac tips for technicians playist. kzbin.info/aero/PLVjetZt5xgenmO76adHwb2ctyeBIFKUus

[@frankgall6]

Total equivalent length

[@tonyedwards9972]

Do you not measure the overall space for tonnage, then measure room size for pipe size, been doing this for 32yrs

[@TaddyDigest]

I only measure for individual pipesizes when I am doing a larger commercial project that requires a A good piping design layout as well as electric

[@TaddyDigest]

You are correct I like that you do it the right way Very cool Thank you for watching I hope you're having a good day

[@bigstepper2235]

my manager told me it was 85cfm for a 6 inch

[@famousdude1239]

6 " Flex or 6" metal per 800 cfm.....? Specific matter!

[@20mikebrown20]

How do you become a member

[@TaddyDigest]

Join this channel to get access to perks: kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin Wanna Learn more about hvac? Check out my hvac tips for technicians playist. kzbin.info/aero/PLVjetZt5xgenmO76adHwb2ctyeBIFKUus

[@FEV369]

Is there a chance I can pay someone (you?) to design my duct system? I have a large two story building and just want to run a main line down the middle and branch out to the upper levels floor venting, having only a few outlets for the lower level. The building is 90 feet long and 40 feet wide, so do I need to reduce my main line to keep pressure up? Things like that seem like it would be easy for someone who dose this stuff, I just don't know where to find someone to ask.

[@TaddyDigest]

Absolutely that's what I'm here for Go check out my membership levels I can do what you want Join and become a member my level 5 membership or level 6 membership is what I recommend Join this channel to get access to perks: kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin

[@FEV369]

@@TaddyDigest I apologize, I don't know about these levels 5 and 6, here on youtube?

[@TaddyDigest]

click the link my friend Join this channel to get access to perks: kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin

[@19993gt]

Can I hire you to guide me thru changing the entire ac system in my home. I have ten years experience in home renovation. Ive never done hvac work other then adding power or gas to a unit. Thank you in advance.

[@TaddyDigest]

Yes I can click the join button and become a member Join kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin

[@19993gt]

@@TaddyDigest bet.

[@alfredoguerrero8596]

What size furnace i need for 1500sqft house?

[@TaddyDigest]

Do a load calculation I would say eighty thousand b t u

[@alfredoguerrero8596]

Thank you

[@coreygriffin7326]

A 6" drop is only 80 cfm though per .05 design static

[@TaddyDigest]

about 75 yes that is correct

[@victorromayor5429]

How do I join

[@TaddyDigest]

Click the link Join this channel to get access to perks: kzbin.info/door/uMyjTVlkM4xZ5z_eSyoB1wjoin Wanna Learn more about hvac? Check out my hvac tips for technicians playist. kzbin.info/aero/PLVjetZt5xgenmO76adHwb2ctyeBIFKUus

[@frankgall6]

TESP?

[@gg80108]

All of the rooms of my home are even temp with the doors to the rooms open. When doors are closed, (why have a door if your not gonna close it), the smaller rooms with the door closed get warm. Seems like no one allows for this common thing!

[@robertlamey7612]

Because people don’t want to spend money on individual room returns

[@michaelburton4025]

Are package units more efficient than split system?

[@TaddyDigest]

No split systems are more efficient than package units

[@michaelburton4025]

Ok thank you I always wondered I was under the impression 16 seer gas pack was equal to a 16 seer split system so I understand now all seer aren't the same.

[@michaelburton4025]

I just had a entire system installed last January 2021 American standard gas package my home never had one and I really looked at the york system's but I was kinda of afraid of the micro channel coil system wasn't for that I would have given you a call brother I'm in Chester co. I may swing over your way and learn some knowledge.

[@TaddyDigest]

I really don't like the micro channel coils Some of the York units don't come with micro channel but some do Glad you got a new system hope all is well with it

[@PRAISEGODMEDIA]

My house is 800 sqft. We just had a two ton unit installed. We have 6-4” and for some reason our bedroom don’t cool as it should. The bathroom and basement is beautifully cool. We have to run window units when the temp gets hot. The thermometer in our house says it gets between 78-85 degrees which is insane considering we put the thermostat to 65 to cool the house. We need the bedroom cool because we don’t want our dogs to be heated. What should we do?

[@nrgheatcool]

Maybe your air conditioner is short cycling because it's over sized(it technically should be 1 or 1.5 ton depending which area of the heat zone you live in) Maybe duct work is sized poorly. Maybe your dampers are closed in the pipes under your supply air grills in the rooms. A proper technician can find the problem.

[@JS-lv5pn]

Every 24ft the duct size should come down to push same amount of cfm.

[@michaelmixon7846]

for got , this is a single story home

[@deanburke3041]

Use a ductalator.

[@biblebloopers946]

What if I have a living room that requires 400 CFM. Instead of using four or five 6 inch ducts, can't I use a couple of 8-in?

[@TaddyDigest]

Yes you can use two 8" ducts and take care of that

[@deanburke3041]

With return air, and filters, the bigger the better. Prove me wrong please.

[@kennethdean4349]

I gave it a dislike because we should NOT assume that a 6” duct will deliver 100 CFM. Measuring air flow is essential instead of using a rule of thumb.

[@TaddyDigest]

Many people that are just starting don't know anything. So instead of supporting somebody that is trying to help by giving them a guideline You're going to try to hurt instead of help Well I appreciate your support anyways thank you have a blessed day

[@eddiegarcia6630]

Hey Tom how about 1.5 ton. I’m going to start a new project sq ft is 600. Please help me out I already hit your subscription channel tks

[@TaddyDigest]

Sounds Good thanks for subscribing

[@TaddyDigest]

Check out the full video Become a member

[@donaldpape1435]

you must be talking metal ducting?

[@TaddyDigest]

yes I was

[@edcroker8163]

What is wrong with this presentation? Is the mission of size of your need of cooling and heating then size your project..

[@Elisummit845]

There's plenty of Information out there. You're saying a lot of good stuff but your duct calculations are not based on any scientific data. What's your TEL? What makes you say that a 6" pipe will give you 100CFM? There's no such thing as " giving" if everything is done right you will get a specific amount of CFM. But there's a lot more then just 6" pipe is 100 CFM. Maybe you save that for where you can make money

[@TaddyDigest]

Always save the good stuff for my members

[@Elisummit845]

@@TaddyDigest I understand. But I think it might be a bit misleading, the information on your board. You will get 100 CFM on a 6", at a specific friction rate.

[@TaddyDigest]

To someone who knows nothing about duckwork sizing it's good information I am giving an average CFM for that 6" duck At least I'm trying to help And I'm doing the best that I can Have a blessed day my friend

[@Elisummit845]

@@TaddyDigest got it. Good work.

[@mattbilodeau2433]

Wow the guy has good content but is trying to make a dollar as opposed to just helping out people. Thats sad idk why people can't just share knowledge for free and help each other grow.

[@TaddyDigest]

I wish I could do this for free. Do you think I want to charge? I want to do this for free. No what's sad is the fact that I have so much that I have to do during the day that I can't just set and focus on this. Do you know how many people I would help if I was to be able to just focus on this every day. I was hoping that the people that really needed the knowledge would support me so that I would then have time and have time to do a lot more. But I have a company to run and I have employees that need to feed their families so I have to do what I have to do

[@TaddyDigest]

kzbin.info/www/bejne/oKDJk5Whi9yspJI

[@Terry86156]

@@TaddyDigest Right now $ makes the world go round as is said. I feel it is an opportunity to forward "money" to someone like you Taddy who is obviously a "service to others" being as opposed to "service to self" person.

[@TaddyDigest]

Thank you Terry really appreciate you