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Infiniteshot
Stranger


Registered: 03/10/16
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Laminar flow hood filter damage. Hepa me!
#26778817 - 06/24/20 09:36 AM (3 years, 7 months ago) |
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Hey all, just received a hepa filter today. 24x24 x6. When I inboxed it I saw these bends in the aluminum. The fabric hepa doesn’t appear to be torn. I’m still a little worried. Does anyone have any feedback to these photos? Thanks a ton for your time.
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Gan
Wielder of Narya



Registered: 08/26/19
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Re: Laminar flow hood filter damage. Hepa me! [Re: Infiniteshot]
#26778835 - 06/24/20 09:44 AM (3 years, 7 months ago) |
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For slight damage, you can bend them back very gently with needle nose pliers or something similar. However, with that kind of damage I'd ask for a refund or an exchange for another filter that isn't damaged. You might be fine just putting it back straight but you wouldn't know until you build you hood
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: Gan]
#26778855 - 06/24/20 09:53 AM (3 years, 7 months ago) |
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Thanks for the quick response. Another filter is on its way. Basically instantaneous great customer service. I’ve built the box and it fits in fine. From what I’ve been reading on this site is that tearing of the medium or separation of the medium from the box are the biggest issues. In a few days I’ll have two on hand and wasn’t sure whether to toss this one or to try and salvage it. I think I’ll install the filter into the box and see how it works. I have a 2.5 air quality monitor and maybe that will give some info. I made the box so that filters can be replaced easily and in a way the back can be removed to check any internal issues.
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Sockadin



Registered: 01/03/10
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Re: Laminar flow hood filter damage. Hepa me! [Re: Infiniteshot]
#26778956 - 06/24/20 10:22 AM (3 years, 7 months ago) |
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You can fix that one. Det a long dowel rod 1/4 from Hardware store and some needle nose. You should see my FH filter after all these years. It's beat to hell. Just straighten for laminar flow.
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RoscoeReturns
Crotchety chode man


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Re: Laminar flow hood filter damage. Hepa me! [Re: Infiniteshot]
#26778976 - 06/24/20 10:29 AM (3 years, 7 months ago) |
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I wouldn’t use that filter. I’ve tested hepa filters for ten years, and any time one looked that bad, it leaked. You may not see a tear on the surface, but the filter is 6” deep. There is likely damage to the filter, and to be honest you might not be able to see it even if it was on the surface. If it was just a small area, I might try to fix it with some RTV silicone, but you would be covering a significant portion of your filter. Without the ability to leak test after install, that is a gamble I wouldn’t want to risk.
Please don’t stick anything into the filter, like a dowel or needle nose. Those aluminum separators can be a little bent up and not hurt anything. You’re more likely to do some damage to the filter while trying to repair them.
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: Sockadin]
#26778982 - 06/24/20 10:31 AM (3 years, 7 months ago) |
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Quote:
Sockadin said: You can fix that one. Det a long dowel rod 1/4 from Hardware store and some needle nose. You should see my FH filter after all these years. It's beat to hell. Just straighten for laminar flow.
Thanks a bunch. I’ll give it a go. I can’t believe how poorly this unit was packaged. Just a basic box. I’ll get on the repair today.
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Sockadin



Registered: 01/03/10
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Re: Laminar flow hood filter damage. Hepa me! [Re: RoscoeReturns]
#26778985 - 06/24/20 10:31 AM (3 years, 7 months ago) |
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How do you test a Hepa for leaks? I'm interested to try this on mine.
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El Chupacabra
Stoned Ape



Registered: 01/07/19
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Re: Laminar flow hood filter damage. Hepa me! [Re: Sockadin]
#26778990 - 06/24/20 10:33 AM (3 years, 7 months ago) |
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If they don't require the damaged one to be returned then it looks like you can make 2 now, or have a replacement hepa. It looks like the damage is just cosmetic just bent aluminum but you can be sure of it by leaving open agar plates in front of your running LFH.
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: El Chupacabra]
#26779009 - 06/24/20 10:38 AM (3 years, 7 months ago) |
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Quote:
El Chupacabra said: If they don't require the damaged one to be returned then it looks like you can make 2 now, or have a replacement hepa. It looks like the damage is just cosmetic just bent aluminum but you can be sure of it by leaving open agar plates in front of your running LFH.
I’m not required to send this one back. The manufacturer says it’s beat to just replace it without all the hassle. (Live good customer care).
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: RoscoeReturns]
#26779012 - 06/24/20 10:40 AM (3 years, 7 months ago) |
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Quote:
RoscoeReturns said: I wouldn’t use that filter. I’ve tested hepa filters for ten years, and any time one looked that bad, it leaked. You may not see a tear on the surface, but the filter is 6” deep. There is likely damage to the filter, and to be honest you might not be able to see it even if it was on the surface. If it was just a small area, I might try to fix it with some RTV silicone, but you would be covering a significant portion of your filter. Without the ability to leak test after install, that is a gamble I wouldn’t want to risk.
Please don’t stick anything into the filter, like a dowel or needle nose. Those aluminum separators can be a little bent up and not hurt anything. You’re more likely to do some damage to the filter while trying to repair them.
Quote:
RoscoeReturns said: I wouldn’t use that filter. I’ve tested hepa filters for ten years, and any time one looked that bad, it leaked. You may not see a tear on the surface, but the filter is 6” deep. There is likely damage to the filter, and to be honest you might not be able to see it even if it was on the surface. If it was just a small area, I might try to fix it with some RTV silicone, but you would be covering a significant portion of your filter. Without the ability to leak test after install, that is a gamble I wouldn’t want to risk.
Please don’t stick anything into the filter, like a dowel or needle nose. Those aluminum separators can be a little bent up and not hurt anything. You’re more likely to do some damage to the filter while trying to repair them.
Hey there. How would you recommend I test the filter? I have an anemometer for air flow and in theory I could inoculate a jar or expose some afar and see what happens. What’s your testing method?
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Sockadin



Registered: 01/03/10
Posts: 7,244
Last seen: 2 months, 20 days
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Re: Laminar flow hood filter damage. Hepa me! [Re: Infiniteshot]
#26779013 - 06/24/20 10:41 AM (3 years, 7 months ago) |
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Hey man if he said don't send it back than it is probably better not to use like Rosco said. I'm not a FH expert, now I'm thinking it might be time to get a new one my self. Mine is 5-7 years old. I can't remember.
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: Sockadin]
#26779018 - 06/24/20 10:44 AM (3 years, 7 months ago) |
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Bogus.
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El Chupacabra
Stoned Ape



Registered: 01/07/19
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Re: Laminar flow hood filter damage. Hepa me! [Re: Sockadin]
#26779024 - 06/24/20 10:46 AM (3 years, 7 months ago) |
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Anemometers are pretty pointless TBH. You should just run a live test by placing clean agar plates in front of it, take the lids off and leave them off for a while. If you end up with contamed plates then you know that you don't have good laminar flow. The only thing I'm unsure about is how long you should leave them uncovered. Someone will chime in I'm sure
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: El Chupacabra]
#26779026 - 06/24/20 10:47 AM (3 years, 7 months ago) |
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Thanks a bunch. Really appreciate it.
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: Infiniteshot]
#26779028 - 06/24/20 10:49 AM (3 years, 7 months ago) |
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Since this is my first flow hood and I can’t make agar plates to rest it before the replacement arrives. Could I just make a few jars of grain that I know for a fact are sterile and then open those up in front of it for the test ?
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Sockadin



Registered: 01/03/10
Posts: 7,244
Last seen: 2 months, 20 days
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Re: Laminar flow hood filter damage. Hepa me! [Re: El Chupacabra]
#26779034 - 06/24/20 10:49 AM (3 years, 7 months ago) |
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That's not testing laminar flow leakage. That's just testing percentage of contamination. I'm really curious how they test laminar flow in the industry. Like a dye of some kind pumped into the back of the fan? Something that won't clog the filter? I really have no idea.
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sandman420
Saint PP



Registered: 06/17/04
Posts: 5,384
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Re: Laminar flow hood filter damage. Hepa me! [Re: Sockadin]
#26779035 - 06/24/20 10:49 AM (3 years, 7 months ago) |
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Its easy to test if you have a particle counter or hot wire anemometer, sometimes you can even feel the breeze with your hands or face. That filter is totally fucked I guarantee it. This is why flowhood filters shouldn't be sent through UPS or FEDEX and only through a freight carrier on a pallet. They are way too fragile for the treatment they get going through those systems. If any of you have worked at UPS/FEDEX you know what I'm talking about. Goddamn Undertaker throws your filter off the top of a hell in a cell and it plummets 16 feet through an announcers table shit.
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Infiniteshot
Stranger


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Re: Laminar flow hood filter damage. Hepa me! [Re: sandman420]
#26779045 - 06/24/20 10:52 AM (3 years, 7 months ago) |
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Thanks man, I won’t chance it. I love your avatar! When Dwight throws that dummy’s face on his own I couldn’t stop laughing. That whole episode is awesome.
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Pastywhyte
Say hello to my little friend



Registered: 09/15/12
Posts: 37,808
Loc: Canada
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Re: Laminar flow hood filter damage. Hepa me! [Re: Infiniteshot]
#26779250 - 06/24/20 11:55 AM (3 years, 7 months ago) |
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I dunno that looks minor to me. Most big labs are not replacing filters everytime someone dents on or jabs a scalpel into it. It’s called a little silicone and it’s good to go. My flowhood had gotten a few small tears and I siliconed them up and it works fine. All my agar comes out fine with it. I wouldn’t even sweat those dents.
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gizmo1


Registered: 06/15/11
Posts: 3,831
Loc: FREEDOM
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Re: Laminar flow hood filter damage. Hepa me! [Re: Pastywhyte]
#26779272 - 06/24/20 12:10 PM (3 years, 7 months ago) |
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Where are you ordering from that lets you keep the old filter.
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