How to Build a 24x24 Laminar Flow Hood

In this video we show you how to build a 24x24 laminar flow hood.
00:00 Intro
01:13 HEPA Filter Test Flow Rate and Pressure Drop (Resistance)
01:36 The Math of The Flow Curves
06:44 Step 1: Cut the Side for the Main Cabinet
07:06 Step 2: Cut & Fasten 2x3
07:42 Step 3: Build the Main Cabinet
08:23 Step 4: Cut the Top Hole for Blower
08:58 Step 5: Install Weather Stripping
09:24 Step 6: Mount the Plywood Strips
10:06 Step 7: Mount the Blower
10:37 Step 8: Cut Sides for Prefilter Box
11:06 Step 9: Assemble the Prefilter Box
11:23 Step 10: Attach the Prefilter Rails
11:28 Step 11: Attach Prefilter box to the Main Cabinet
11:50 Step 12: Wire Blower and Switch
12:35 Step 13: Attach Plywood Strips for Back Panel
12:42 Step 14: Add the HEPA Filter
13:03 Step 15: Silicon the inside of The Main Cabinet
13:12 Step 16: Attach the Back Panel and Silicon Shut
13:24 Step 17: Cut and Fasten Front Plywood Strips
Dayton 1TDU2 Blower
electricmotorwarehouse.com/da...
1TDU2 Specification Sheet
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1TDT9 Specification Sheet
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Koch BioMax Filter 24x24x11.50
www.kochfilter.com/file/11858...
48 x 24 Laminar Flow Hood Plans
blog.freshcapmushrooms.com/wp...
Pressure Drop Furnace Filter Study
www.texairfilters.com/compara...
FREE Mushroom Growing Guide!
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66Qt Monotubs & Dry Bulk Substrate Kit
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Dry Bulk Substrate Ingredients Kit
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Inflatable Monotubs for Sale!
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[@battybird6716]

Just starting out with cultivating mushrooms myself..I'm never going to make this but watching you is inspiring.. so bright and bubbly. Your enthusiasm is infectious.

[@BoomerShroomer]

So nice of you! Thank you. Mush love!

[@x1Conan3Spartan0x]

😂😂 ayo. Your funny and on point.

[@laurencerosenthalwinckler4439]

@@BoomerShroomer you could have done the calculation in excel with both metrics and american units to put on the description!

[@laurencerosenthalwinckler4439]

I am trying to read your comment but is it even English? What are you speaking about? I was asking about flowhood calculations.

[@Enochulate88]

If Yu want to go far with it then you will buy one

[@johnrutherford2326]

Thank you. You are the only person (besides myself ) to add a pre filter to the hood. This is such a critical part of a flow hood to remove large air particles and extend the life of the expensive Hepa filter. I also like that you show us the math to do the proper flow calculations, this is where I was struggling. So, in the end, I got a stronger fan and added a motor control knob to adjust the flow of the air. Great tutorial!

[@chrisimai4540]

This, like all your videos, is really packed full of amazing info. Thanks for sharing your knowledge!

[@silverbeowoulf]

I really enjoyed all the science behind choosing the right filter and fan

[@mjmc400]

Thank you for the instructions. I followed many of them. It came out awesome..❤❤

[@paulinezehnder-swader]

Greetings, Ashley. am proud owner of your monotub and excited to follow along with your videos all along the way. You must be a biology math science genius. Brilliant and love your mailing inserts. What an adventure. as a nurse, I fully appreciate the sterility and your approach to achieve. best wishes, Polly Zehnder-Swader

[@cw4608]

Glad to see you use torx screws. Great choice. Thanks for the explanation of, and calculations on, laminar flow.

[@BoomerShroomer]

Thank you!

[@isaacfindsthefeather7922]

@@BoomerShroomer 24x24x11.5 is that the one you used?

[@BoomerShroomer]

@@isaacfindsthefeather7922 yes

[@BugRaiser]

This is actually pretty cool and since you did all the math and even made an instruction book imma give it a try.

[@estebancoco9444]

thank you so much for the information you bring to all of us, regards from Bariloche, Patagonia Argentina

[@mikewhite255]

New to this hobby , can't wait to get my first set up ! It's all in the mail lol. Anyways I thank you for sharing your knowledge with us new people. It's literally invaluable.

[@WhoDeyWildcatsReds]

This was 7 mos ago. I'm wondering how it's going? All my supplies are in the mail right now! Anything you've run into that you wish you'd known beforehand? Any tips?

[@joshuamanchester6288]

Fascinating, well done folks!

[@BoomerShroomer]

Thank you!

[@MOLRobocop]

Pretty awesome build. I'd personally go smaller with any I made, due to the space. But overall a really good tutorial.

[@BoomerShroomer]

Thank you! It is pretty big and tough to move.

[@TraderRoss]

I made one mostly like this. I used same filter but had a larger fan I already had. I use it on low & made little feet to raise up & let some air bleed off before the big box. Of course it has 2 pre-filters. But the biggest thing I did different was to bring the bottom & side boards out maybe 15-18 inches for a workspace & added a piece of glass on top that I can shine a light through. It's pretty damn huge but functions great. Only downside is it needs 220v outlet & not portable at all. I wish I had a small one to for the apartment for temp use.

[@jaysizzle3023]

What size room you use yours in

[@s.t.rajkumarprasath1733]

Fantastic work. Thank you 😊

[@BoomerShroomer]

Thank you!

[@huntintrailmetals9343]

Nice work y’all

[@pepperaudet257]

Excellent info. Greatly appreciated. Thank you!

[@BoomerShroomer]

Very welcome! Thank you!

[@andyballenger38]

Very thorough! 😁 🍄 thanks!

[@BoomerShroomer]

Thank you!

[@tommynorthwood]

Direct to the point and so detailed and well informed, I'm speechless. Subscribed liked, loved and appreciated

[@BoomerShroomer]

Thank you! 🥰

[@stevegram9000]

great instructive video🍄

[@daddydank3357]

Another great video!!!

[@BoomerShroomer]

Daddy Dank thank you!

[@Milkex]

oh very nice. I just bought a labconco for the home lab but I'll forward this video to interested colleagues.

[@BoomerShroomer]

Sweet! Thank you!

[@Milkex]

I broke down my 6ft labconco because it was just too damn large, kept the furnace blowers and other parts and went looking for a good build video and re-found your video! Two friends ended up using your vid to make hoods, one for fungi and the other for metronomy!

[@arnwilson8199]

Awsome as always. I will be building one in a month. Thank You

[@BoomerShroomer]

Awesome! Thank you!

[@Ely_507]

Exelent, thanks for yogur help. I am from Panamá.

[@Matt-lp1xp]

Great video and construction. Very involved and expensive

[@BoomerShroomer]

Definitely more expensive than I expected. But you can definitely do it for cheaper.

[@romullen3971]

Great job!

[@nickluke5144]

Thumbs Up. This is a great tutorial video!

[@BoomerShroomer]

Thank you! Cheers!

[@MrGidaro]

Hi, I like your approach and explanation to derive the filter curve. I did in a slightly different manner: as the Flow rate through the Prefilter and Hepa must be the same (they are in series, IN=OUT), the total resistance of the system should be computed considering the HEPA filter nominal FR. Then for each filter, the pressure drop is given for an initial phase, working phase and final state. So in principle 3 curves could be derived, but the one we are interested in is the working phase. Thank you so much for this. Giovanni

[@BoomerShroomer]

Thank you!

[@ronaldantasekjr42]

Thanks

[@middleway1885]

Boop! Sweet tutorial! Thanks, cheers!

[@BoomerShroomer]

Thank you!

[@timlaubach9588]

great video. I feel like I am ready to grow!

[@BoomerShroomer]

Tim Laubach thank you! 🙂

[@SubFlow22]

I really like this design. I recently found a local source for foam PVC. I find this to be a better alternative than wood, being completely plastic, water-proof, anit-microbial, lighter and cheaper. I needed to buy special cutting discs and whatnot for cutting plastic, but overall I think it was worth it.

[@francislebelge8468]

thanks a lot this is perfect and incredible channel , i love this , thanks to france it so nice to learn to grow mushroom now , thank for the knowledge

[@santiagonahuel8845]

Great video, you give me Anne Shirley vibes

[@BoomerShroomer]

Thank you!

[@charlie27775]

The first thing I need to do this is a partner that is capable! After that it looks really really easy! Thank you!

[@kepreza]

you are so badass. Love your channel and videos.

[@BoomerShroomer]

Thank you!

[@Oppenheimer1968]

Thanks!

[@nicholasmoore1182]

Yoo dope video.

[@BoomerShroomer]

Appreciate it! Thank you!

[@kenlogan5017]

Thanks for this video! I'm getting close to being done with mine! Did you use armored cable between the blower and switch, or did you wire straight to the switch from the blower? I don't see a good reason to use armored cable but I'm not an electrician.

[@Grungeman17]

Would like to help out, those dayton blowers are mighty expensive and move significantly to pressure drop and require these deep calculations. Centrifugal blowers. That look like flying saucers often used as carbon scrub blowers have a much higher resistance to pressure drops. And can be purchased all day between 50- 100$ the filter is always gonna be the varible item in the build im trying to get this info out to flowhood builders to check into centrifugal blowers.

[@BoomerShroomer]

Thank you

[@3dp_edc]

Adding in here as well, I prefer the Inline Grow room Blowers. Also much less then the squirrel cage and also better than centrifugal blowers (which are similar to squirrel cage anyways, unless your thinking of a different blower and are mistaken calling it a centrifugal blower because centrifugal look identical to squirrel cages) because the inlines are speed controller compatible meaning you dont have to do any blocking or drilling in your box you just move the knob to where you want your airflow at. Check out the fusion breathe line up thats the kind i got and again like you said much less drop at resistance from these as well as they are specifically designed to blow through blockage and carbon filters to filter smell of cannabis.

[@BoomerShroomer]

@@3dp_edc Cool thank you! Could you send a link? Are they cheaper?

[@3dp_edc]

@@BoomerShroomer yeah cheaper than everywhere offering daytons here in canada anyways, if your in the US you might have better luck finding daytons for around this price but its under 100 USD for this fan www.growlights.ca/8-inch-inline-fan.html

[@3dp_edc]

Oh, i forgot to mention these are also much quieter than squirrel cage style!

[@dbells626]

I'm building one roughly based on this. Thank you!

[@BoomerShroomer]

Awesome, have fun!

[@iliketoeatstuff]

so much math, I'm getting dizzy from all the math! LOL! great video so far! thanks for all the info!

[@naturalsurvival1536]

Thanks, this is a great source of information and it appears correct. A lot of other videos and resources want you to start with the listed resistance of the filter (many will suggest 1.0 WG) but fail to take into consideration this resistance is at a certain CFM, in your case 650 CFM. Lots of people miss that the filters have a resistance proportional to the amount of air being pushed through them. My question is how are you checking to see if you have a laminar flow or not? Are you using an anemometer? Thanks for your thorough videos.

[@BoomerShroomer]

I used smoke at first too see if the flow looked turbulent or laminar. It was not an exact science for me. I ended having to vent the back because the flow was too heavy. Now it seems to be just about right and when working in front of it I have very little contamination. I am going to do some testing with petri dishes to see where contamination might be getting in. I would love to test the laminar flow with an anemometer! Might look into getting one.

[@naturalsurvival1536]

I just purchased one, once I get my filter set up I am going to try it out. I will reply here and let you know if it was worth the effort. Thanks for the reply and further information!

[@VictoriousGardenosaurus]

@@naturalsurvival1536 was it worth it?

[@naturalsurvival1536]

@@VictoriousGardenosaurus it was, it gave me a decent idea if I had any dead spots and the speed/volume of air coming out. It was pretty cheap as well.

[@claudiovanduijn5305]

@@BoomerShroomer I have a similar set up. Would you happen to know how large of a hole you put in the back to vent it? Might save me the trouble of trying to perfect it!

[@deiondyson512]

Your a damn genius

[@Pierce1987]

Thank you I’ll be building one soon. I can’t believe people give companies their money for something you can build at home for 1/5th the cost.

[@BoomerShroomer]

Yeah and its kinda fun!

[@evanbrant8022]

Professor, may I use the restroom? Lol just got some school vibes. Loving all off the educational information. Fantastic teacher!

[@TheFrontierseeker]

I find it interesting that ALL the tools look brand new :)

[@ThatWTFGuy]

Have you considered adding a UVC lamp inside the box?

[@maxeisele]

hi! heading to bluilt this flow hood, thanks for sharing this!! but i have a doubt... why did you decide that the main drawer should be so deep (25.5")?

[@sachinm.r1285]

Only video I needed to make my own Flowbox. Thankyou for taking the time to make this video.

[@noahdave4199]

Hi, thanks for your awesome videos, I got a question , can I use air purifier inside a tent instead of flow hood ?

[@20031792]

Grate job. God bless you. What about pre filter 🤔

[@eddiecinbombin]

Hi!! Pretty nice work. Been follow for a while and now I’m going to build kill my own flow hood using your instructions. I just have a question is you don’t mind. I wonder if you can share the exact measure of the back panel. I was confuse when you add silicone at the back panel because the picture when tou screw to the panel seem to be slightly different. I Would apreciare so much. Have a nice one Tha

[@rockon1323]

A supply list and a diagram showing a 24x24 flowhood would have been helpful . Thanks for the video!

[@criscoregelo]

might i recommend a kreg jig for next time for the box securing

[@aosmosis6385]

Thank you for sharing!! Do you have a list of the specific tools and materials you used? Such as type of wood used, screw size... etc.

[@BoomerShroomer]

I followed the flow hood plan in the description. It tells your everything you will need! From fresh cap mushrooms 🍄!

[@aosmosis6385]

@@BoomerShroomer Thank you :)

[@robertbates151]

Awesome video! I've struggled to grasp the math, which has paralyzed me from moving forward with purchasing materials and building it (OCD is a pain sometimes lol). I love the way you break it down, and for the first time I'm starting to get it. My only question has to do with the cubic footage of the actual box that houses the filter and builds the air pressure. Does the cubic footage of the box change the math, or does larger/smaller cu.ft. require a larger/smaller blower?

[@BoomerShroomer]

No, it really doesn’t matter. Really the size the HEPA filter and the blower are important things. If you send me the blower and HEPA filter you are thinking about I can do the math for you and see if it is a laminar flow.

[@crsmade]

Just build around the filters and it’s all good

[@dandelionboy7820]

Wanna build this with the same dimensions except with the filter 6 inches in depth. Would this affect the resistance?

[@can2190]

Hi thats a good work. Ashley how many m3 of fan?

[@Loki_FPV666]

If you want to reduce the flow of the cabinet you could also use a variable AC adapter (variac) to reduce the speed of the fan

[@BoomerShroomer]

Thats a good idea. I ended up just venting the back with 15 half inch holes and it works great.

[@billyzwiener1380]

@@BoomerShroomer How do you know if it's too much? As in how did you decide yours needed 15 half inch holes? Thanks. Enjoyed your video

[@natte480]

What other filters would you recommend??? I cant seem to find the one that your using

[@freddiesachen6577]

Dear Ashley. You can use a cheap blower from a used Ac unit and a variAC..MAKE YOUR FLOW RATE WHAT YOU WOULD LIKE

[@richardmullane9279]

Hi I love the video I wanted to know I wanted to add a extra filter on the filter and how to calculate the strain or airflow because I don’t like the idea of having just one filter in it getting dusty inside the box when I could just put another little filter on the outside of the blower motor thank you

[@BoomerShroomer]

I added the pre filter into my math. You just need to add the resistance of the pre filter with the resistance of the HEPA and that will give you the total resistance of both.

[@richardmullane9279]

I’m sorry one other question if you don’t mind I know you’re busy how long do these filters generally last I can’t find anything a year couple years thank you I appreciate everything

[@BoomerShroomer]

@@richardmullane9279 the guy that sold me mine told me if you have a pre filter and keep the laminar flow is a cleaner room with not a lot of dust that the HEPA filter can last for 5-10 years if not longer. He told me he sells them to hospital that use them in their ventilation systems and they usually replace them every 3 years and they are going 24/7, 365 a year. So depending on how much you use it it could virtually last you a lifetime. So I would recommend getting a 99.99% efficient instead of 97.99. I wish I would have bought the more efficient one cause I basically will never have to replace it unless I I want too.

[@Tony-gm1pb]

Love this video, very informative and detailed, Is there a list of wood and tools needed for the job? I’ve ordered the fan and filter but just want to know exactly what to get for the rest of the build

[@BoomerShroomer]

I used Freshcap Mushrooms 48x24 guide. It is a little bigger but all the same material. learn.freshcap.com/wp-content/uploads/2020/05/DIY_Flow_Hood_Plans_FreshCap_Mushrooms-edited.pdf

[@Tony-gm1pb]

Boomer Shroomer thank you so much I really appreciate you providing a link, are you on Instagram? I’d love to give a follow, my Instagram is @mycolah_ have a nice day!

[@BoomerShroomer]

@@Tony-gm1pb Yes, I am! instagram.com/boomershroom/ Thank you! Let me know if you have any more questions.

[@bencelovasz534]

Hey thanks for the video, it's real nice you put a lot of effort into explaining your process for beginners, this helped me a lot. I have the exact same setup as you so this is very helpful. The only question I have is what size is the backplate you used for the main box? I have to go get this woodcut at a home depot so it'd be nice to know ahead of time. Cheers and thanks again

[@BoomerShroomer]

Thank you! 😊

[@grxygxds]

@@BoomerShroomer what size backplate do you use?

[@BoomerShroomer]

@@grxygxds I just measured it to size. I’m not 100 percent sure.

[@jimmyblaze3250]

@@grxygxds probably a little late but I'd assume it's 25.5. 24"+¾"*2

[@TheCorso1981]

Did the Flow Hood working as intended ? I'm wandering If the filter size is big enough.

[@CarolDunitz]

Do you have a suggestion about where to buy a reasonably-priced HEPA filter for this project?

[@BoomerShroomer]

I would suggest looking local. Sorry I can't be of more help.

[@mcledesm]

my crazy scientist a** is dying to do this!

[@allenwilhelm7799]

Math and shrooms. I love it

[@relaxandpanic8988]

Thank you for the video! I see the fan you bought was a little too strong for your preference, would you recommend a different one for someone following your build? Thank you !

[@BoomerShroomer]

I ended up drilling 12 holes in the back of the laminar flow to reduce the speed. Let me look back at the blowers and see if there is a better fit now that I know how much power it has.

[@relaxandpanic8988]

@@BoomerShroomer okay thank you I appreciate it !

[@BoomerShroomer]

@@relaxandpanic8988 I think this blower would be suitable for the filter I bought. When I do the math it comes out to be about 410CFM and if we divide that buy out 24x24 filter. That gives us about 102 CFM through the filter which is perfect! The blower I got has so much power. I ended up drilling quite a few holes and did not have to silicone the back and it still has sufficient flow. Plus this blow has mounting brackets already built in which it nice. electricmotorwarehouse.com/dayton-model-1tdt3-blower-559-cfm-1600-rpm-230v-60-50hz-4c870/

[@BoomerShroomer]

If you reach out to me on Instagram I can show you the pics of the graphs of the blower with the flow curves.

[@themyceliumnetwork]

@@BoomerShroomer could you have not have just added a speed dial ??

[@ziggy7736]

do u have the plans available of pdf by chance?? easier for some including myself to see all the materials and measurements on paperwork so to speak, thank y for ur time

[@ammuluammu6789]

What can i use H13 or H14 hepa filter. Is H13 enough for flow hood

[@markleikin9852]

Hi Ashley , I have done this build with 2 different people , sets of supplies . We have found that we cannot good consistent flow rates at different spots around the filter. And there are dead spots. One of my knowledge friends says it’s probably because there isn’t a “baffle” in the plenum. Was wondering if you tested the flow on yours and if your speeds are consistent/ no dead spots. Also if you have any insight on this matter . Using the tdu2 and slightly weaker resistance filter but like 8 pre filters

[@tomrodriguez4768]

Watch out Don’t buy this larger blower motor. The cfm rate is way to high. I went with Ashley s choice even with her statement that she “ Wasn’t quite sure so she went with the larger one”. Should have been a Red Flag statement. This motor Blows out the lighter test 2 feet away!!! Also drilling holes only screws up the laminar flow besides blowing crap around the space your in. So I have a nice plywood box ,a 12”thick filter and $300 plus useless motor. 😢

[@jamesmorrow2594]

Hey I got some good filters but after arriving I found that it has charcoal in it.. will that screw everything up?

[@mmcvip]

Correct me if I'm wrong but are you taking the derivative of the HEPA and pre-filter curves as if they were linear? The proper way to do it would probably be to add the two curves and then plot that against the fan curve to find the point of intersection. I know these plots are not always readily available from the manufacturer, so the way you do it is a good approximation. Also you should not add the test flow data from the HEPA filter to the graph because it does not include the pre-filter pressure drop.

[@wesleyfunderburg8231]

I am looking at a 24x24 HEPA filter with .79” WG, and the Dayton 1TDT8 2 speed blower (797/549 CFM). Will this combo work or should I try for a less powerful blower? Love your videos! Any help is much appreciated!

[@BoomerShroomer]

I’ll look at the math tomorrow and let you know.

[@wesleyfunderburg8231]

@@BoomerShroomer thanks so much!

[@BoomerShroomer]

Yep, I just did the math and that combo should work fine. Comes out to be around 101 CFM through the HEPA filter. Should be perfect. I also factored in a pre-filter and it should work with that too.

[@dreadlegend7365]

This video was excellent, especially the specifics on the fan. Why doesnt anyone face their pre filter to the side of the blower that sucks in, instead of above it?

[@BoomerShroomer]

Thank you! Good question. I have no idea. I am sure you could do it that way.

[@dreadlegend7365]

@@BoomerShroomer thats good enough for me- i think i will! Unless i find out a reason to do otherwise ill make it so both filters are in front but with a divide between them. I'll be using your video and equations through my build,, so, thankyou again!

[@BoomerShroomer]

@@dreadlegend7365 No problem . Thank you!

[@vanessabearzatto5422]

That is an awesome video, thank you. Do you ever need to clean the hepa filter? If so, how would you?

[@BoomerShroomer]

Let me make a call to PCI filtration systems and ask them about cleaning.. I haven’t really thought about it. But the guy i talked with there was super helpful and I’m sure he would know. Just give me a few days and I’ll get the answer for you.

[@vanessabearzatto5422]

@@BoomerShroomer Oh waou. Thx then. ❤️

[@BoomerShroomer]

@Vanessa Bearzatto I talked to Dave at PCI Filtration services and he said most people don't clean their HEPA filter because it reduces the over all quality. They end up just replacing it. But he also said if you have you laminar flow hood running 24x7x365 the HEPA filter would last 3 to 4 years. It will take quite awhile before you need to replace it.

[@vanessabearzatto5422]

@@BoomerShroomer Ok thank you for your time. I am getting a 61*61*6,8 cm h14 hepa filter from a company that make filters so hopefully it will be a good quality long lasting one.

[@vanessabearzatto5422]

@@BoomerShroomer Cheers a lot

[@jasonm.1370]

What filter did you go with? The plans show a 24 x 48? Please help.

[@BoomerShroomer]

Use the same one FreshCap Mushroom used. It will be in the description under his instruction guide. Thanks!

[@o0oxJellyxo0o]

I am literally about to follow this to the letter. I thought buying the fan and the filter was expensive.... Until I saw how much the wood was. Oh well, worth it.

[@stephanieosongco8650]

what about the prefilter on top of the blower? What did you use? Where is it from? Thank you so much for your help.

[@BoomerShroomer]

It is a 16x25x1 normal furnace filter and I bought it from home depot

[@bramvansynghel5386]

Hi there ! Great video, thanks for all the details and the quality of the explanations, real good job !! I am actually trying to build my own, but i can't find anywhere the specifications for the pre-filter i should buy... i suppose that there is a recomended size and quality for a 24 x 48 Flow Hood with a H14 HEPA Filter, but i'm struggling with it ^^ Thanks in advance, greetings from france ;)

[@BoomerShroomer]

Just like a furnace filter will work for the pre filter. Mine is 16x25x1

[@bramvansynghel5386]

@@BoomerShroomer thanks for the quick answer 🥳 all right for the size ! but my question was more about the size of the particules the prefilter should be able to remove? As the job of the HEPA is only to block the finest contaminants and we want to préventif it from being obstructed by dust or other fine stuff (sorry by the way for my aproximate english ^^)

[@BoomerShroomer]

@@bramvansynghel5386 I think they are like 10 micron. You can get better pre filters I got one from PCI filtration system that was 13 micron. Did I answer your question?

[@bramvansynghel5386]

@@BoomerShroomer yep, this is what i'm looking for, thanks !! 😁

[@wigglewigglewiggle7021]

Hi Ashley, I'm a Noob and Love your channel . Would like to ask what way is the best way to add seed spawn to substrate. I saw that you layered it in one of your videos .And how much /thick of a final top layer of substrate (1"?) . How thick total? I have mixed the grain and substrate also layered it. reason I'm asking is I had mycelium turn green. Maybe due to over misting , not enough vent holes/ Don't know :(..I have added bigger vent holes and mist less. any Tips I appreciate you:)

[@BoomerShroomer]

Your contamination came from either the substrate or the spawn. Did you pasteurize the substrate before you use it? I usually make my substrate layer around 3 inches but it does not have to be perfect.

[@wigglewigglewiggle7021]

So that's what I'm having a hard time with I live in a farm community so I'm able to get corn wheat Milo millet oats and none of them have been perfect even though I use a pressure cooker for all of my grain and I've also got discouraged to the point where I sterilized my substrate in a pressure cooker in a turkey bag. So currently after many different grain fails the best I've found is Milo but if you can suggest something I would love to hear it. Most of my grain fails are after pretty good mycelium growth inside my mason jars there will be green moldy powder when I shake the jar was the most common not sure what to do to stop it. I'm thinking I'm doing most things correct a side of the fact that I don't have a laminar flow Hood currently using a still air box but planning to change that soon. I don't give up persistence out does resistance LOL 😁

[@BoomerShroomer]

@@wigglewigglewiggle7021 If you are getting contam after you shake the jar then most likely you are not sterilizing the grain long enough. I was having contamination problems with grain too and I stated to sterilize it for more than 2 hours to make sure to kill everything. Now they are usually alway contam free. How long did you sterilize for? I do my bags at 15 PSI for 2 hours.

[@emmauruguay]

Hi Ashley. I'm Emma from Uruguay. The filter must be 6" depth, or i can use a 2" 2/3 instead. Thank you so much!!!

[@dandelionboy7820]

I was thinking of making this cabinet except thinner. Perhaps 13in to be exact. Do you think air flow will at all be affected by this?

[@dandelionboy7820]

Yea nvm. I see now the pre-filter nor the fan would fit

[@animefreak195]

Would it be possible to modify for the filter to easily slide in and out through a drawer system?

[@BoomerShroomer]

I am not sure.

[@kennyboob1337]

Oh your voice is sharrrrp arrg

[@jasoncarey2092]

Curious why at the beginning you are expressing the values in inches of water ("a pressure drop of .9 inches of water"). I know laminar flow is part of fluid dynamics but didn't realize that measurements would be in inches of water so curious if that is correct. Anyway thanks for sharing the knowledge

[@naftalibendavid]

Whew! Nice work. Let me know what you folks would charge...

[@BoomerShroomer]

Biggest thing I would change is buying a smaller blower. I ended up having to vent the back.

[@naftalibendavid]

@@BoomerShroomer beats not having enough flow...

[@BoomerShroomer]

@@naftalibendavid that’s why I went bigger. And if I ever want to go to a 24x48 flow hood, that blower will work. Maybe one day.

[@peterboek9384]

Thanks for the cool video! Can anyone tell me if the material of the filter is important, apart from the efficiency rating? I bought an AstroPak filter, with a rating of 99,99% efficiency but not made out of metal (made out of paper / fabric like material). Does this matter? (sorry if this is a stupid question!)

[@alisondouthitt5281]

I am thinking of making a flowhood using a astrocel 24x24x5 7/8 filter with a w.g. of 1. I am thinking of using the same 1tdu2 and according to my calculations the blower is about twice as strong as it needs to be. Kinda the same situation as you. I was wondering if you have had any problems with it coming out at 200 ft/s instead of what Paul staments says100 ft/s?

[@TangoNevada]

I know this is like asking how long a Light Bulb will last, but in general how long before you need to replace the filter?

[@BoomerShroomer]

I talked to a lot of people about this and this will basically last forever. Hospital use these filters throughout their buildings and they keep them on 24/7 365 a year and they last 5-10 years. So in a personal space where you are using it maybe one a week? It will pretty much last forever.

[@TangoNevada]

@@BoomerShroomer That's answer I was hoping for. That being said, I may be having some household arguments about Cats.

[@justinbuntin2202]

Would the flow area be the same for this filter? NCHP242412S910. I can’t seem to find the flow data

[@BoomerShroomer]

Yes, it is going to be extremely close. This is exactly the same specs as mine.

[@hempwick8203]

i bought the same filter yet to construct the box due to some SHITTTTT, but... Our filter is rated at 1.0"WG 1100CFM and says on the website "24x24x11 1/2 |40|1100" which is dimensions, weight(of filter), and CFM. NC Filtration. Thanks for the vid!

[@BoomerShroomer]

@@hempwick8203 Sweet!

[@elabran36]

First time I see your channel and is pretty interesting, I wondered if all those supplies can be purchased online. Thanks for bring us all your knowledge with your videos, greetings from North Carolina. PS. Let me know if you have Facebook, I will glad to be a follower on fb too.

[@BoomerShroomer]

Yes, I purchased everything online.

[@tomrodriguez4768]

😊

[@ranjanty]

I don't understand why people are putting the pre filter on the top of the blower instead of the side where the intake is?? I'm building a 2 x 4 and thinking of putting the filter on the intake side. Any reason why I shouldn't?? Would it be to powerful in direct line? Is that the reason for the top?

[@davidbrewer8309]

Seems way more complex than it needed to be, also why would you drill holes into the pre-filter cabinet only to put wood particles in it for your filters to clog up with? Just curious

[@christopherkopper2837]

Yeah she overcomplicated it a bit

[@maddexxx847]

Did i miss the the part about pre filter. I didn’t see what you used

[@mikekillrewar2813]

Is the laminar flow hood absolutely necessary for growing mushrooms?

[@ddsherds50]

Is it possible to just use a rainbow vacuum?

[@grounder84]

Where and how do you find the pressure drop or flow rate of the pre filter? I'm looking at filtrete filters and can't find it.

[@christopherkopper2837]

I had to email the manufacturer

[@jallisonh28]

Hi! Love your channel! I'm extremely green at all this, but I'm just growing fancy mushrooms for myself and my daughter to show her science is cool, so I'm not producing nearly as many as you. Do I absolutely need one of these? Can I just do everything in front of my regular hepa filter? I can attach pic. Thanks so much! Hoping to Fruit our first bag of lion's mane soon!🤞

[@BoomerShroomer]

No, you definitely don't need one of these. Just use a room with minimal airflow and you are good.

[@jallisonh28]

@@BoomerShroomer thank you so much for your reply! I will just try in bathroom and hope for the best! Is the flow hood just for cloning and spore prints and agar plates? I'd love to try all that in the future! Thanks again!

[@kcksd10]

@@BoomerShroomer how about when fanning? Can you just do that in a normal room in your house or do you want to be in a low air flow air purified room as well?