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PitcherCrab
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Registered: 12/02/06
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Loc: The bottom of the sea.
Last seen: 1 year, 3 months
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HEPA damage?
#25889173 - 03/21/19 09:45 PM (5 years, 8 days ago) |
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Hey all, I'm putting together a flow hood and today when moving the HEPA around I accidentally touched part of the pleats on the back side (oops!) and damaged them a little. You can't see super well from this picture, because I pushed them back into place but I broke through one of the pleats and damaged a few others. I've read about patching badly damaged ones with hot glue by filling the entire cell, but this doesn't seem severe enough to call for that. My question is, how badly does a HEPA need to be before it needs to be patched, does a little damaged section like this cause any issues with the filtration? For reference, the total thickness of my filter is 4.25".
-------------------- PC's LAGM 2021 (TOC & TWC)P. natalensis Growlog 2021Pans for PC Fall 2021 Growlog “I must not fear. Fear is the mind-killer. Fear is the little death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.” - Bene Gesserit Litany Against Fear
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sandman420
Saint PP
Registered: 06/17/04
Posts: 5,384
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In my opinion you should patch that up with silicone. It will probably cause some turbulence.
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dlp33
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Registered: 03/21/19
Posts: 6
Last seen: 4 years, 10 months
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You can patch with hot glue or silicone, but filling the entire cell is not always necessary- the damage is seldom to the horizontal part of the filter, many times you can just patch the hole on the vertical part if that makes sense. Just make sure to check both sides and after it is patched test it under working conditions to see if you can feel increased airflow from any particular area. A patch may cause turbulence but it is the holes you can feel a difference in flow. As long as the turbulent area is well inside the laminar flow as a whole it should be ok. If you have an anemometer that is even better but you can usually discern a hole from putting your face or hand up to it.
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sandman420
Saint PP
Registered: 06/17/04
Posts: 5,384
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Re: HEPA damage? [Re: dlp33]
#25889263 - 03/21/19 10:38 PM (5 years, 8 days ago) |
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I meant the hole would cause turbulence, after patch it wont affect the flow too much. Having an area blowing much faster will make problems when you have an untended hole. Also the filter isn't 4.25" thick, it's about 1/8"-1/4" thick and folded up in an accordion to fill the frame. You've pretty much busted right through to the other side.
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sandman420
Saint PP
Registered: 06/17/04
Posts: 5,384
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What ever happened with that blower mounting situation you had?
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PitcherCrab
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Registered: 12/02/06
Posts: 2,446
Loc: The bottom of the sea.
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Quote:
sandman420 said: I meant the hole would cause turbulence, after patch it wont affect the flow too much. Having an area blowing much faster will make problems when you have an untended hole. Also the filter isn't 4.25" thick, it's about 1/8"-1/4" thick and folded up in an accordion to fill the frame. You've pretty much busted right through to the other side.
Ah damn! Thought I was being soo careful too... So I should patch it with a bit of silicone smoothed over the damaged sections to hold it together, and that should do the trick? I really haven't messed with HEPAs before. Its made of strange material, kinda fibrous and gauzy.
Quote:
sandman420 said: What ever happened with that blower mounting situation you had?
I decided on getting some angle aluminium and some self drilling metal screws. I'm going to mount them to the blower then to the top of my box, then use silicone to seal up any cracks. May throw some aluminium tape over the top just to be sure.
I've been so busy with work today was the first free day I had to work on my mycology stuff. I was hoping to get the flow hood done today, but didn't get started until late and I ran out of time. Got most of the box built, but ran into some tolerance issues. Should be able to finish it up in the next week or so. I'll post pictures and details of my build once I'm able to get back to it again.
-------------------- PC's LAGM 2021 (TOC & TWC)P. natalensis Growlog 2021Pans for PC Fall 2021 Growlog “I must not fear. Fear is the mind-killer. Fear is the little death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.” - Bene Gesserit Litany Against Fear
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sandman420
Saint PP
Registered: 06/17/04
Posts: 5,384
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Hey man shit happens. I somehow damaged more than one filter before hehe. Yea the filter material is some wildly fragile and odd feeling stuff right?
Hot glue or silicone either would work fine. Hot glue may flow a little better and get in those holes easier.
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PitcherCrab
Crescent Fresh
Registered: 12/02/06
Posts: 2,446
Loc: The bottom of the sea.
Last seen: 1 year, 3 months
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Quote:
sandman420 said: Hey man shit happens. I somehow damaged more than one filter before hehe. Yea the filter material is some wildly fragile and odd feeling stuff right?
Hot glue or silicone either would work fine. Hot glue may flow a little better and get in those holes easier.
Thanks for the info, you've been super helpful! I'll update with pics etc once I've got them...
-------------------- PC's LAGM 2021 (TOC & TWC)P. natalensis Growlog 2021Pans for PC Fall 2021 Growlog “I must not fear. Fear is the mind-killer. Fear is the little death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain.” - Bene Gesserit Litany Against Fear
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