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Boogieman47
Let's boogie


Registered: 03/05/16
Posts: 9,712
Loc: Under your bed
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this is my flowhood 24x24x11.5 why would you want to use 2 12" thick filters ?? One should be good whats the micron%?? ....
I used that tub to bog down the air flow all i really did was build everything up and cut a small hole until the lighter was at about a 65° angle then if it nedds more are i just will cut a bigger hole till i have the same results
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CapnZ
Dimensional explorer



Registered: 12/22/16
Posts: 1,420
Loc: In the Mystic
Last seen: 3 months, 12 days
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Quote:
bodhisatta said: the plenum doesn't need a special design it just has to be big enough to put even pressure over the back of the filter.
more people have home made flow hoods than bought ones on this site 

I did this to my plenum. It's a trick I picked up from a guy with yards of HVAC experience. They charge bib bucks to install something like this in your home HVAC ductwork. It does improve airflow efficiency and minimizes turbulence. This is a pic from the build. The white material is styrene but any bendable plastic or vinyl sheet that's not too flimsy will do.
-------------------- Deep into the darkness peering, long I stood there wondering, fearing, doubting, dreaming dreams no mortal ever dared to dream before...
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hamloaf
Loaf of Fam.


Registered: 12/23/09
Posts: 20,192
Loc: Oklahoma.
Last seen: 1 year, 8 months
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Quote:
bodhisatta said: the plenum doesn't need a special design it just has to be big enough to put even pressure over the back of the filter.
more people have home made flow hoods than bought ones on this site 

The plenum needed to be between 12-24 inches long in order to build static pressure. I went with 24 inches.
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Tripping2Adventure
StealingKnowledge



Registered: 03/28/16
Posts: 371
Loc: Under a Rock, Bottom of t...
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First off, thanks for the plethora of responses everyone.
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Boogieman47 said:

I used that tub to bog down the air flow all i really did was build everything up and cut a small hole until the lighter was at about a 65° angle then if it needs more are i just will cut a bigger hole till i have the same results
Hey, I like that tub idea to dial it down if need be. Does it make the motor quieter too? And is that restricted airflow harsh on the motor at all? Does it get hot? All the dayton blowers on the Grainger website say they are not recommended for speed controllers, but I see people on here doing it all day long.
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Boogieman47 said: Oh shit haha i misread that i thought he was going to put them behind each other my bad op ...
I'm not overthinking it that much... lol.
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bodhisatta said: the plenum doesn't need a special design it just has to be big enough to put even pressure over the back of the filter.
This is what I wanted to confirm. I assumed so based off the lack of information I'm finding in regards to the plenum dimensions. Or maybe because I just figured out the term for the space is 'plenum'?? lol Thank you 
Quote:
CapnZ said:
I did this to my plenum. It's a trick I picked up from a guy with yards of HVAC experience. They charge bib bucks to install something like this in your home HVAC ductwork. It does improve airflow efficiency and minimizes turbulence. This is a pic from the build. The white material is styrene but any bendable plastic or vinyl sheet that's not too flimsy will do.

I had this idea in my head, but didn't want to 'break the tek' and do some unnecessary work that would end up biting me in the ass. I'll definitely implement this in my design. Thanks!  
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c10h12n2o said: right.
op, you might be interested in my flowhood build, it is a lot different than what most people do, its patterned after real ones
i suggest modeling it in 3d first (thats what i did), sketchup is perfect and free
everything looks right to me, but model it first to save time and materials
I remember looking at your build before I got my filters and fan, I'll have to go give it another look. I did a hand 3D sketch on paper, just don't know any free decent software for doing that stuff on the computer. Not too familiar with all that.
It might be worth putting out here though, I am considering utilizing a fab/metal shop that i have a hook-up with. I had an idea of building this box using a steel frame, having aluminum/ thin steel sheets for the box made with flanges (flanges is not the proper term I'm looking for, drawing a mental blank). The reason I wouldn't want to do this is because it's going to be heavy as fuck. Between the two filters and the blower alone, I have over 100lbs. That's without the box/frame.
Doing a standard plywood board box for this thing would probably be more efficient, but having a metal one fabbed up would be pretty cool IMO. I would post my 3D sketch if I had it with me, but I'm at work.
Thanks for the input!
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c10h12n2o
serial dilutor



Registered: 01/21/15
Posts: 3,200
Loc: the abyss
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Re: Flow Hood [Re: hamloaf]
#24432878 - 06/24/17 09:10 PM (6 years, 7 months ago) |
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thats why i suggested sketchup, its free software from google, easier than anything else, great for laying out cuts, modeling, etc
id definitely consider using a metal fab, but it is by no means necessary. plus, metal is a lot harder to adjust than wood, i wouldnt use metal unless i was 10000% sure about my measurements and had everything modeled in 3d with proper tolerances my buddy bought the massive one from FP and has it hooked up pretty nice, i should post a pic. we mainly use it for tissue culture work though
i got my filter from fp, just to be sure of the dimensions and the arrival date, but i got the blower from cl and built the rest out of wood, sheet aluminum, and plexi. mine is 24x24 and heavy as shit. it has outlets, lights, speed controller, usb quick chargers, etc built in
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Hamington Loafburg said:
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c10h12n2o said: it depends on the area and depth of the filter in question
the point is to provide enough space to equalize the pressure over the filter face to provide laminar flow
How deep of a plenum do you think would be good for a 2x4 foot hepa with pre filters?
if im not mistaken, it depends on the thickness of the filter. if the filter is around 6" you need a plenum at least 6" deep. if the filter face is 2x4 ft, i think it just needs to have that same area of 8 sq ft. my filter was just under 6" deep so i used a plenum of 8" and have PERFECT laminar flow from edge to edge.
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  C10's Agar Guide + Tips and Tricks | c10's Flow Hood Build Guide "Partial knowledge is more triumphant than complete knowledge; it takes things to be simpler than they are, and so makes its theory more popular and convincing." "Convictions are more dangerous enemies of truth than lies" ― Friedrich Nietzsche
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Tripping2Adventure
StealingKnowledge



Registered: 03/28/16
Posts: 371
Loc: Under a Rock, Bottom of t...
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I appreciate everyone's help and advice when i planned this out.
A year or so later, I finally have gotten around to buying the materials to assemble this.
Here's some progress pictures. It is not finished, just functional enough to test.
http://







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