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OfflineBubinatorX
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DIY flow hood max plenum depth
    #28016226 - 10/25/22 04:03 PM (2 years, 2 months ago)

I’m building a small 12x12 flow hood. My filter is 12x12x3.

I was hoping to build the box big enough to also accommodate a 6” filter should I have to replace mine and decide to go with a better quality alternative. 

My question basically is there such thing as too much/too deep of a plenum?

My 3” deep filter leaves 15” of plenum. 

I dug thru the forum and looked around but couldn’t quite find the answer I was looking for. I know generally speaking 12” of plenum is ideal or 2x the depth of the filter but mine will be 5x the depth of my filter if I keep it this size. 

The website where I bought this filter sells a hood with 12” of plenum behind the 3” filter (15” total depth - mine is 18”).


Edited by BubinatorX (10/25/22 04:37 PM)

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OfflineRusty2096
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Re: DIY flow hood max plenum depth [Re: BubinatorX]
    #28016364 - 10/25/22 05:15 PM (2 years, 2 months ago)

12x12? Can you even have a jar and a plate in front of that at the same time?

Edit: I'd highly recommend you to build a SAB instead if you can only build a FFU that small at the moment.


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Edited by Rusty2096 (10/25/22 05:16 PM)

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OfflineBubinatorX
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Re: DIY flow hood max plenum depth [Re: Rusty2096]
    #28016544 - 10/25/22 06:36 PM (2 years, 2 months ago)

I hear what you’re saying but honestly I’m just looking to close the loop and make my own LCs with a higher success rate + Im gonna have this thing built for under $150.

Here is my mock-up. Waiting for the blower before I cut a hole in this thing and screw it all together.

Is this thing going to be too deep or is that not even a thing to be concerned about?


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OfflineRusty2096
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Re: DIY flow hood max plenum depth [Re: BubinatorX]
    #28016590 - 10/25/22 06:59 PM (2 years, 2 months ago)

Post your project and questions is the official FFU thread. You'll get more answers ☺


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Offlinerumfor69
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Re: DIY flow hood max plenum depth [Re: Rusty2096]
    #28016602 - 10/25/22 07:05 PM (2 years, 2 months ago)

It's not an ffu though :shrug:


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OfflineRusty2096
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Re: DIY flow hood max plenum depth [Re: BubinatorX]
    #28016605 - 10/25/22 07:05 PM (2 years, 2 months ago)

Semantics :kingcrankey:

Edit : I concede


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Currently looking for nothing. You guys who sent me stuff are straight up awesome!. :mushroom2:

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Edited by Rusty2096 (10/25/22 07:06 PM)

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OfflineBubinatorX
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Re: DIY flow hood max plenum depth [Re: Rusty2096]
    #28016619 - 10/25/22 07:13 PM (2 years, 2 months ago)

It’s ok if you don’t know the answer to my question.

If I wanted to gorilla tape a furnace filter to a box fan I wouldn’t be here asking for advice on plenum depth lmfao.

Edited by BubinatorX (10/25/22 07:15 PM)

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Offlinerumfor69
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Re: DIY flow hood max plenum depth [Re: BubinatorX]
    #28016636 - 10/25/22 07:19 PM (2 years, 2 months ago)

LoL I've never built a fh but i don't think your plenum can be too big. Especially only that much larger. The fan fills the sealed box with air and if you fan is matched to the filter specs it starts coming through the filter evenly when the filters static pressure resistance is met. Bigger plenum I'd just think it'd take an extra second to fill it up.


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OfflineBubinatorX
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Re: DIY flow hood max plenum depth [Re: rumfor69]
    #28016667 - 10/25/22 07:39 PM (2 years, 2 months ago)

That’s what I was thinking tbh.

I’ve seen it suggested here that BIGGER is BETTER (i.e. 12” is better than 6”) so my question really was is there a point of diminishing returns in regards to plenum depth?

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Offlinerumfor69
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Re: DIY flow hood max plenum depth [Re: BubinatorX]
    #28016690 - 10/25/22 08:00 PM (2 years, 2 months ago)

I wouldn't think diminishing no. But say it was a 3 foot deep plenum it'd be a waste cause it wouldn't do anything more than a 15" plenum would.


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