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Laminar Flowhood (HEPA) Build Questions

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Phlux-

Phlux-

The Root
OG Pioneer
I put this together over the past few days and have an issue :- Uneven Air Flow :(


The blower is a Kruger KDD 7/7 165W 4P-1 1SY w/mf 1300rpm
The HEPA is a 610mm x 305mm x 70mm 0.3um 99.9991% H14 fibreglass media with a aluminium frame.
The pre-filter is an opel corsa (spp of car) air filter

holding a lighter or even a hand infront of the hepa filter exposes the fact that the airflow is not even - there is enough airflow near the top and bottom of the filter to most often extinguish a lighter flame whereas the pressure around rest of the workspace is even and doesnt extinguish the flame but rather bends it.

is my possitive pressure too high ? does the prefilter mounted between the blower and hepa create turbulance ? would a motor speed controller fix it ? etc, etc, etc... ?

i need to get this device operational asap (pleurotis farming atm)

thanks for yawl input.


here are some pics (will upload more later)
 

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ok looks like i read the wrong datasheet - my blowers spec's are well off.
attempting to get the blower changed by the supplier
nobody has a viable workaround ?

attached is the datasheet (its the second unit in the datasheet)
 

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According to Stamets book you want 100f/s air flow for most hepa systems. Calculate it by the area of the filter under the cubic feet per second of the fan being used.

Example: a 2'x3' filter has an area of 6sq.ft. so you'd need 600cu.ft/s from your fan at whatever backpressure your filter provides.
 
Those are very tricky devices - I wish I had experience in building one to lend a hand. I do have experience in reading a really long thread on shroomery though about a guy who was very knowledgeable in making one.

Perhaps the only advice I can muster from that thread would be to go to the manufacturers of your parts and ask for suggestions on flowhood applications. With that particular guy/thread, it seemed to be the difference maker, if I recall.

GL!

I spent some time on a SAB that I'm happy with, and even though no contam issues since, it'd sure be nice to have one of those.

:thumb_up:
 
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