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PhytoExtractum Shop: Maeng Da Thai Kratom Leaf Powder

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InvisibleTripping2Adventure
StealingKnowledge
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Registered: 03/28/16
Posts: 371
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Flow Hood
    #24431448 - 06/24/17 11:42 AM (6 years, 7 months ago)

A little while back I purchased two new Grainger HEPA filters, very nice ones. They list for $763 each on the Grainger website, but I got a very nice deal on them (under $300 for both).


My idea was to build a single flow hood with both these filters, and have them side by side. I have the fan to accommodate them both, if I did my math right. The blower fan is a Dayton 1TDU2 model.

The filters have 1.0" of initial static pressure. I plan for .2" for prefilter. That's 1.2" static pressure

The blower pushes out between 850-1000 CFM at 1.2" of static pressure.

The area of one filter (2'X2'= 4ft) times 2 filters (8ft)

The cfm I would need to blow at least 100cfm out the filter is (8ft X100cfm= 800cfm)

So, what I need is a fan the blows at least 800cfm @ 1.2" of static pressure, which I have as stated 3 lines above.


Should I run into any issues running two filters off of one fan in the same box?

I can't find a solid answer (maybe I'm not searching in the right places) on how much depth should be behind the filters?
The filter has a 12" depth, so would something like an additional 16" behind that be sufficient enough? Making the total depth of the box to be 28".

The front length of the box will be about 50" to accommodate the filters, and the height will be about 25".

I kind of just wanted to post my ideas so far on this forum so I can get any possible necessary criticism to avoid me from overthinking or missing something completely. Would like to avoid any costly mistakes.

Thanks guys!!


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InvisibleTripping2Adventure
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Re: Flow Hood [Re: c10h12n2o]
    #24432768 - 06/24/17 08:17 PM (6 years, 7 months ago)

First off, thanks for the plethora of responses everyone.

Quote:

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.

Quote:

Boogieman47 said:
Oh shit haha i misread that i thought he was going to put them behind each other my bad op :spaceman:...




:lol: I'm not overthinking it that much... lol.


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.





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:thumbup::thanx:


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! :thumbup::thanx:

Quote:

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!:thumbup::thanx:


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InvisibleTripping2Adventure
StealingKnowledge
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Registered: 03/28/16
Posts: 371
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Re: Flow Hood [Re: Tripping2Adventure]
    #25362199 - 08/02/18 01:29 PM (5 years, 5 months ago)

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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InvisibleTripping2Adventure
StealingKnowledge
I'm a teapot User Gallery


Registered: 03/28/16
Posts: 371
Loc: Under a Rock, Bottom of t...
Re: Flow Hood [Re: Tripping2Adventure]
    #25362217 - 08/02/18 01:40 PM (5 years, 5 months ago)

So... this post is made in regards to testing the unit.

I have not attempted to put a speed controller on the fan yet. I am getting plenty of CFM through the filters... the issue is the flow is uneven


around the edges of the filter has the strongest flow, enough to put a lighter out at some spots... other spots just perfect for mycology work.. and then dead spots in the middle.

Is the issue with my plenum? with the separation of flow in-between the two filters? How should i start diagnosing this issue?

I have a few ideas in my head of the problem and what to do... but I want to hear some voices outside of my own head first.


Thanks again!!


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