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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Are 2 Filters Next to Each Other a Bad LFH Design?
#23430896 - 07/10/16 11:58 PM (7 years, 6 months ago) |
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Two filters would create a somewhat wide gap somewhere in the middle because of how most of these filters are framed/encased.
This would probably screw up laminar flow, wouldn't it?
I like the size I could build this way. I would also save a few bucks but there would be no savings if it didn't work!
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Supalemonhaze
Spore syringe hater.



Registered: 10/02/15
Posts: 6,725
Loc: 12" down Europe's butthole
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Re: Are 2 Filters Next to Each Other a Bad LFH Design? [Re: PutACapInHisAss]
#23431111 - 07/11/16 02:25 AM (7 years, 6 months ago) |
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I asked someone who said was going to build one like that once but I didn't receive an answer. The problem isn't laminar flow as both filters will be blowing parallel to each other. My doubts are in the gap that is left, I can see it being entirely possible that contams are able to travel down that gap and finally be blown forward once they get stuck in the flow. If they are able to travel half way down the filter before being blown forward, that could be problematic.
I think I have seen a hood build similar to this though, can't remember how big the gap was unfortunately. At the time, I didn't own one and wasn't planning on building one either so I didn't ask.
Edit:
If you are planning something along the size of 2x2feet, it's best to just buy one at that size rather than two smaller ones. The one I saw was made with two large filters so it would have been easy for the user to keep his work out of the gap. Better safe than sorry. A hood is something that costs quite a bit of money compared to the stuff we have to buy and it's something that lasts for a really long time. Better to just bite the bullet and do it right the first time rather than making a very costly mistake.
I would make do with a SAB until you can afford a proper filter. Cutting corners with something like this is silly, it's not just a jar of grains that's on the line.
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PutACapInHisAss
Stranger Than Fiction



Registered: 08/11/07
Posts: 252
Loc: Earth
Last seen: 6 years, 4 months
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Re: Are 2 Filters Next to Each Other a Bad LFH Design? [Re: Supalemonhaze]
#23431720 - 07/11/16 10:28 AM (7 years, 6 months ago) |
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Quote:
Supalemonhaze said: My doubts are in the gap that is left, I can see it being entirely possible that contams are able to travel down that gap and finally be blown forward once they get stuck in the flow. If they are able to travel half way down the filter before being blown forward, that could be problematic.
Yes, that seems reasonable. I have been considering boxing out my flow area, not for this reason, just to be certain I am not outside of the flow--especially at the top. This might mitigate such a problem by preventing particles from easily slipping down into this weak spot.
Quote:
Supalemonhaze said: Better safe than sorry. A hood is something that costs quite a bit of money compared to the stuff we have to buy and it's something that lasts for a really long time. Better to just bite the bullet and do it right the first time rather than making a very costly mistake.
I would make do with a SAB until you can afford a proper filter. Cutting corners with something like this is silly, it's not just a jar of grains that's on the line.
I generally agree. I'm not a cutting corners kind of guy. But, it is not entirely about cutting corners. It also creates more options for the final size and shape of the flow area.
For example, I have found filters that were about 21" x 26". With two of these I could have a hood that is both wide and 2-4 inches taller than more common heights at 22-24 inches.
Thank you for your thoughtful input!
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