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ouuwee
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Plywood for flowhood / Dimensions for a 24x24x6 filter
#26847164 - 07/27/20 05:06 AM (3 years, 6 months ago) |
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I'm looking to purchase some plywood to build my laminar flowhood. I was wondering which of the two will work?
Sande Plywood - $46 https://www.homedepot.com/p/18mm-Sande-Plywood-3-4-in-Category-x-4-ft-x-8-ft-Actual-0-709-in-x-48-in-x-96-in-454559/203414066
BC Sanded Pine Plywood - $35 https://www.homedepot.com/p/23-32-in-x-4-ft-x-8-ft-BC-Sanded-Pine-Plywood-201428/100061386
If possible, I would rather purchase the cheaper $35 one since I'll need to buy other supplies such as screws, silicon, etc. Just not sure if it will work since I know nothing about woodwork. Will I be able to spray iso/water on the surface of the wood? Would it be ruined/get moldy? Also, the thickness of both those wood aren't exactly 3/4". One is 0.709" and the other is 23/32" (~0.719"). Would I have issues with sizing/designing the box using 3/4" since it will be an easier number to work with? How would I go about finding the dimensions of the pieces that I will need since I will be requesting home depot to help me do the cuts for me. I have a 24x24x6" filter coming in so I would need some help with the dimensions
Edited by ouuwee (07/27/20 05:08 AM)
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sandman420
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: ouuwee] 1
#26847174 - 07/27/20 05:11 AM (3 years, 6 months ago) |
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I used the sande for my last hood. It has just a few voids inside , so the exposed ends look a lot better.
You would want to at least hit it with some primer. Something like Kilz at least.
Ill lay you some dimensions out it wouldnt take long.
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ouuwee
Garden of Weeden



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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: sandman420]
#26847177 - 07/27/20 05:15 AM (3 years, 6 months ago) |
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Quote:
sandman420 said: I used the sande for my last hood. It has just a few voids inside , so the exposed ends look a lot better.
You would want to at least hit it with some primer. Something like Kilz at least.
Ill lay you some dimensions out it wouldnt take long.
That would help alot!!!!! And just to make sure, the purpose of a Kilz primer is so it provides an outer coating allowing liquid to be used on the surface? Water or oiled based? What's the difference between a can/bucket of primer vs a Spray can like this https://www.homedepot.com/p/KILZ-Original-13-oz-White-Oil-Based-Interior-Primer-Spray-Sealer-and-Stain-Blocker-10044/100371323? I'm not sure if I will need a whole gallon can of primer for a flowhood.
Edited by ouuwee (07/27/20 05:20 AM)
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rido



Registered: 05/13/19
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: ouuwee]
#26847182 - 07/27/20 05:23 AM (3 years, 6 months ago) |
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If you're worried about cost, the 12mm (1/2 inch) plywood should be fine for your use. It'll be lighter but still plenty rigid. This one: https://www.homedepot.com/p/12mm-Sande-Plywood-1-2-in-Category-x-4-ft-x-8-ft-Actual-0-472-in-x-48-in-x-96-in-454532/203414055
They can usually cut the plywood for you if you ask. Way easier than doing it yourself, and easier to transport, too.
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ouuwee
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: rido]
#26847184 - 07/27/20 05:28 AM (3 years, 6 months ago) |
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Quote:
rido said: If you're worried about cost, the 12mm (1/2 inch) plywood should be fine for your use. It'll be lighter but still plenty rigid. This one: https://www.homedepot.com/p/12mm-Sande-Plywood-1-2-in-Category-x-4-ft-x-8-ft-Actual-0-472-in-x-48-in-x-96-in-454532/203414055
They can usually cut the plywood for you if you ask. Way easier than doing it yourself, and easier to transport, too.
Thank you for the recommendation! However, I will be putting in the screws myself and I am VERY inexperienced with using tools. Not even exaggerating, the last time I held a hammer or a drill was actually playing with toy hammers as a kid. I would prefer using the thicker 3/4 so I don't split the wood or something.
Edited by ouuwee (07/27/20 05:29 AM)
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sandman420
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: ouuwee]
#26847203 - 07/27/20 05:50 AM (3 years, 6 months ago) |
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this one has a 1/8 gap around the filter so you can slide it in...There would have to be some kind of strips that the filter gasket presses on behind or in front of the filter. The back piece is 24 1/8" square. This is more the standard style. The prefilter box isnt drawn on top because I dunno. If you want I can lol. This has a meaty 15" plenum.

Personally I now do my filter fit a little different. I make a slightly larger gap around the filter so that I can just put it in there and use window spray foam (only window soft version not the other stuff!) around the filter to seal it in there. This may seem a little crazy and it kinda is but it gets a guaranteed seal around the filter and you can still easily remove and replace the filter if you need to. You can cut the foam so easy with a drywall knife and just pull it out stick a new one in and respray. Bobs your aunty. Just make sure to lift to filter up a little with a few pieces of some cardboard or something so you can foam the bottom of the filter. So here's one with a bigger gap to spray foam around the filter. The back piece is 24-1/2" square.

lemme know any questions or if you want the sketchup file.
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sandman420
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: sandman420]
#26847208 - 07/27/20 05:53 AM (3 years, 6 months ago) |
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Making a box is harder than people might think. One janky cut or errant screw makes the hole thing go wonky. Take your time. Triple check.
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ouuwee
Garden of Weeden



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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: sandman420]
#26847220 - 07/27/20 06:14 AM (3 years, 6 months ago) |
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Quote:
sandman420 said: this one has a 1/8 gap around the filter so you can slide it in...There would have to be some kind of strips that the filter gasket presses on behind or in front of the filter. The back piece is 24 1/8" square. This is more the standard style. The prefilter box isnt drawn on top because I dunno. If you want I can lol. This has a meaty 15" plenum.

Personally I now do my filter fit a little different. I make a slightly larger gap around the filter so that I can just put it in there and use window spray foam (only window soft version not the other stuff!) around the filter to seal it in there. This may seem a little crazy and it kinda is but it gets a guaranteed seal around the filter and you can still easily remove and replace the filter if you need to. You can cut the foam so easy with a drywall knife and just pull it out stick a new one in and respray. Bobs your aunty. Just make sure to lift to filter up a little with a few pieces of some cardboard or something so you can foam the bottom of the filter. So here's one with a bigger gap to spray foam around the filter. The back piece is 24-1/2" square.

lemme know any questions or if you want the sketchup file.
I think I'll use the 1/8" gap around the filter. Also, could the plenum be 10"? I know that the plenum should be at least the depth of your filter (which is 6"). So if I double that making it 12", and taking the middle number between 6 and 12 which is 9" but just to use an even number, I'll make it 10". I don't want to make the flowhood bigger than it needs to be since I don't have much space. Also, what would be the dimensions for the back?
Edited by ouuwee (07/27/20 06:25 AM)
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sandman420
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: ouuwee]
#26847228 - 07/27/20 06:32 AM (3 years, 6 months ago) |
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Sure you can just adjust the 1'-9" depth measurements on the pieces if want to change the plenum. Just subtract the difference, mine gives 15" so for a 9" plenum you would just shave 6" off those 1'-9" depth measurements giving 1'-3" depth.
Only thing you have to make sure the whole thing is big enough for the blower to sit on top and have a prefilter box and everything...Make sure your blower isn't too long you know waht I mean?
I put the dimensions of the backs on each design in the post at the ends of the paragraphs, for the 1/8 gap design it's 24 1/8 square. These are for a back that fits inside for a flush back (like the filter sits) If you would prefer a back that would fit "outside the box" I can make those dimensions too. 2' 1-9/16" square for the 1/8" gap version.
I forgot to say the top and bottoms are the same sizes and the left and right pieces are the same size, might make more sense if I said that if it wasn't obvious sorry.
Edited by sandman420 (07/27/20 06:42 AM)
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ouuwee
Garden of Weeden



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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: sandman420]
#26847254 - 07/27/20 07:03 AM (3 years, 6 months ago) |
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Thank you for those dimensions! I'll wait for my blower to arrive to see how much plenum I would need.
Also, can you explain to me why the bottom piece is 25 9/16"? From my understanding, the filter is 24", add 1.5" (3/4" + 3/4" = 6/4" or 12/8") to account for the 3/4" thickness from the side pieces, then add 1/8" for gap
24" + 12/8" + 1/8" = 25 5/8"
Edited by ouuwee (07/27/20 07:08 AM)
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sandman420
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: ouuwee]
#26847257 - 07/27/20 07:04 AM (3 years, 6 months ago) |
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Yea because its not adding 3/4 and 3/4 its adding 0.709 and 0.709 for the sande 3/4 wood...not sure if I mentioned that or not lol
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ouuwee
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: sandman420]
#26847263 - 07/27/20 07:12 AM (3 years, 6 months ago) |
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Forgive me for being so dumb lol. Didn't even think about using the actual measurements. Thank you again I appreciate it so much! Also, could you answer some of the questions I have about the primer on the 3rd post?
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sandman420
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: ouuwee]
#26847309 - 07/27/20 07:55 AM (3 years, 6 months ago) |
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No difference in the spray that I know of. You would probably need a around a quart or two of paint or sealer I would bet.
You can also use something like deck sealer or clear polyurethane instead of primer if you want a wood look instead of a white primer look.
If the wood work turns out real nice, hitting it with some stain of your choice and then some polyurethane clear would make it look hella sick instead of primer.
Edited by sandman420 (07/27/20 08:03 AM)
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dothedew69
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Re: Plywood for flowhood / Dimensions for a 24x24x6 filter [Re: sandman420]
#26904975 - 08/28/20 08:57 PM (3 years, 5 months ago) |
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Kills has a new antibacterial, mood, fungi sealer out now and that’s what I’ll be using. I’ll be using a protected stain on the exterior and possibly polyurethane depends on how fancy I want to make it. I got all my supplies for inside the box and it all fights microbes or resists them. Check out some of the new kilz products and caulks. I ran into the same issue for wood, I may pony up for the more expensive wood for easier calculations. They also have this expanding window sealing foam that could also work very well I was going to use it on the air entrance side.
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