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Offlinemushpunx
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Uneven flow on new flow hood
    #26630976 - 04/26/20 10:56 PM (3 years, 8 months ago)



So I built a new, smaller hood that I can move around. Same parts as the Series 1 on Fungi Perfecti, a 12 x 24" mini pleat HEPA and a Dayton 1tdt2 blower. It has about a 6" plenum behind the filter/furing strips.

The lighter test works out well for the most part but I can feel a stronger flow around the edges and some slow spots in different spots on the filter.

The box is sealed up well on the inside with silicone, the filter has weather stripping on the back and is pushed up tight against the furring strips inside.

The grate I used in the front is super thin, it's held tightly between the moulding and the filter. What I'm worried about is maybe air is leaking through that tiny gap?
Tommorow I'm going to take the grate out and put the moulding back on and see if it  fixed it.

What do you guys think?
It doesn't have a prefilter on yet but I think it should be dialed in without it with this blower/filter combo:shrug:


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InvisibleSmartattack
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26631005 - 04/26/20 11:11 PM (3 years, 8 months ago)

You're probably over thinking it. What you have is going to catapult your abilities to do this shit despite a couple places seeming too drafty. Run some test plates in front of it, that's the pudding that counts anyways.


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: Smartattack]
    #26631031 - 04/26/20 11:23 PM (3 years, 8 months ago)

Thanks man. It's definitely more than drafty though I think it's leaking air.

I pulled the grate off and put the moulding back on, same thing so it's not the grate.



On my last hood,I didn't silicone the tiny gaps around the front of the filter, and the front moulding was tight enough to keep it from leaking.


I'm thinking maybe on this one I just need to run a bead of silicone around the front there?


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Edited by mushpunx (04/26/20 11:25 PM)


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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26631064 - 04/26/20 11:35 PM (3 years, 8 months ago)

Are you sure your filter is facing the right direction? Most of the filters I've bought have the weather stripping facing out (go figure).


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: Cpt_Hyman_Shocker]
    #26631094 - 04/26/20 11:59 PM (3 years, 8 months ago)

Where do you get your filters?

The last hood I built, an 18 x 24" the filter had the weather stripping on the back. It was a pin type

I'm pretty sure this one did too, it's a mini pleat type filter

I like having the weather stripping push up tight and get a good deal against the furring strips.

I just added a bead of silicone in the gaps around the filter, I think this will solve it


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Edited by mushpunx (04/27/20 12:33 AM)


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Invisiblec10h12n2o
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26631127 - 04/27/20 12:36 AM (3 years, 8 months ago)

I'd silicone all the gaps


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: c10h12n2o]
    #26631136 - 04/27/20 12:47 AM (3 years, 8 months ago)

Quote:

c10h12n2o said:
I'd silicone all the gaps





Yeah that's what I ended up doing. We'll see if that fixes it.


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26632793 - 04/27/20 07:10 PM (3 years, 8 months ago)




Yep, a little bead of silicone in the little gaps around the front of the filter solved it 😀

I'm happy it turned out to be such an easy fix


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Invisiblec10h12n2o
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26633084 - 04/27/20 09:23 PM (3 years, 8 months ago)

Awesome, glad that worked :smile:


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Re: Uneven flow on new flow hood [Re: c10h12n2o]
    #26633088 - 04/27/20 09:25 PM (3 years, 8 months ago)

Nice! Now get to work.


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Offlinerumfor69
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Re: Uneven flow on new flow hood [Re: Smartattack]
    #26633208 - 04/27/20 10:36 PM (3 years, 8 months ago)

Yeah I think in my series 1 the weather strips are on the outside against  the mouldings


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: rumfor69]
    #26633463 - 04/28/20 02:34 AM (3 years, 8 months ago)

Quote:

rumfor69 said:
Yeah I think in my series 1 the weather strips are on the outside against  the mouldings




I think FP was getting one style of mini-pleat and then switched. The one they show a photo of has a black casing

https://fungi.com/products/24-x-12-x-5-8-mini-pleat-micron-filter?_pos=16&_sid=f26aa922e&_ss=r

When I ordered it, mine came with a silver casing and the pleats are sunk in a little bit on each side. On mine, the side with the weather stripping, the pleats are sunk in considerably further than the other side.
In my box there is a 1/2" furring strip of wood that runs around the inside of the walls behind the filter, where it is pushed up nice and tight against.

My other filter, the 18 x 24" pin type, had the same deal, the side with the weather stripping had the pins set back


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Edited by mushpunx (04/28/20 09:32 AM)


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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26633604 - 04/28/20 05:14 AM (3 years, 8 months ago)

Looking at the pleats that looks like either the back of the filter or it's just a regular HEPA HVAC filter for your private residence.

You really want to end up with something that's uniform and machine formed at the very outlet of the air.


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: tramalot]
    #26633921 - 04/28/20 09:25 AM (3 years, 8 months ago)

Quote:

tramalot said:
Looking at the pleats that looks like either the back of the filter or it's just a regular HEPA HVAC filter for your private residence.

You really want to end up with something that's uniform and machine formed at the very outlet of the air.





It's a mini-pleat filter, it's a bit more expensive, it doesn't have the aluminum pins you are used to seeing. In the top photo of my hood fully assembled, there is a grate in front of the HEPA to prevent damage, maybe that is what is throwing you off.

Here:

  "As with our standard line of HEPA Filters, the Mini-Pleat filters offer filtration down to .3 microns with a guaranteed efficiency of 99.99%. The difference is in the filter media: the Mini-Pleat filters use a tighter folding pattern without aluminum separators, providing the same level of filtration in a smaller pack while reducing resistance and promoting greater air flow. For these reasons, the EAMF2412M is the recommended replacement filter for the Series I Laminar Flow Hood, and is also recommended for use with the EAFB1 and EAFB1E All-Purpose Blowers."

https://fungi.com/products/24-x-12-x-5-8-mini-pleat-micron-filter?_pos=16&_sid=f26aa922e&_ss=r


Edited by mushpunx (04/28/20 07:25 PM)


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Offlinerumfor69
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26634728 - 04/28/20 03:51 PM (3 years, 8 months ago)

Quote:

mushpunx said:
Quote:

rumfor69 said:
Yeah I think in my series 1 the weather strips are on the outside against  the mouldings




I think FP was getting one style of mini-pleat and then switched. The one they show a photo of has a black casing

https://fungi.com/products/24-x-12-x-5-8-mini-pleat-micron-filter?_pos=16&_sid=f26aa922e&_ss=r

When I ordered it, mine came with a silver casing and the pleats are sunk in a little bit on each side. On mine, the side with the weather stripping, the pleats are sunk in considerably further than the other side.
In my box there is a 1/2" furring strip of wood that runs around the inside of the walls behind the filter, where it is pushed up nice and tight against.

My other filter, the 18 x 24" pin type, had the same deal, the side with the weather stripping had the pins set back




Hmmm weird, well I'm glad it's working good for ya now and it wasn't a big fix


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: rumfor69]
    #26634857 - 04/28/20 04:51 PM (3 years, 8 months ago)

Me too haha

I actually unbolted my blower to look at the other side of the pleating and it's identical.

I'm really curious if these have a forwards and backwards now though


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Offlinerumfor69
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26634888 - 04/28/20 05:06 PM (3 years, 8 months ago)

I wonder the same thing with my furnace hepa filters. They're the exact
same on both sides but the arrow says that way so wtf it goes that way
i guess lmao


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InvisiblebodhisattaMDiscordReddit
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Re: Uneven flow on new flow hood [Re: mushpunx]
    #26634915 - 04/28/20 05:15 PM (3 years, 8 months ago)

Quote:

mushpunx said:
Me too haha

I actually unbolted my blower to look at the other side of the pleating and it's identical.

I'm really curious if these have a forwards and backwards now though



It's more about the seals and glue and construction


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: bodhisatta]
    #26635112 - 04/28/20 06:43 PM (3 years, 8 months ago)

Makes sense to me, thanks!

Fuuck me though, thinking about this is making me paranoid and really wanting to double check mine.
My last filter had the weather stripping on the back, I am fairly certain I checked and put this new one in the right way but now I like *have to know* hahah

Ugh that means cutting out the caulk I just sealed it with :shrug:


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Edited by mushpunx (04/28/20 06:51 PM)


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Offlinemushpunx
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Re: Uneven flow on new flow hood [Re: mushpunx] * 1
    #26635179 - 04/28/20 07:27 PM (3 years, 8 months ago)

Mother fucker.

I'm glad I checked, I found an arrow, it was backwards.

This style of filter has the stripping on the front :facepalm:

Oh well, easy fix, just spin it around :shrug:


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