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Old 02-19-2020, 07:12 PM #1
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Combat Mold Issues With HEPA: The Inexpensive DIY Solution

Why HEPA?

HEPA filtration is the number one defense against molds and fungal issues with cannabis. Harvest molding while it dries? Trimmed flowers molding in your jars? Packed a bunch of cannabis away, and come back to find it's ruined with mold? In a well ventilated flowering room (3 complete exchanges of air per minute), over the 2-3 month cycle, the trichomes of your plants can pick up an amazing number of mold spores.

When moisture levels and temperatures levels are high enough, those mold spores will cause enough mold to ruin a harvest in only a few days.

HEPA filtration stops fungal spores, stray pollen, bear and beaver dander, feces dust from all kinds of animals, pet hair, human hair, carpet and clothing fibers, bugs and more.Once you've smoked HEPA grown cannabis for a while, everything else starts feeling harsh in comparison.

HEPA filters are so cheap to build, everyone with DIY skills should be using them. I recently built one for the LED cab I'm building, and figured everyone here could benefit from a separate thread.

Here's the completed filter, attached to a fan.


The 'Plenum' before installing the filter. This can be as simple as 1x4 and thin plywood, screwed together and sealed with caulking. With larger sized filters, you'll want to cut multiple square holes, leaving cross braces. This filter size '14x20' will filter up to an 8" fan, and a 25x25 filter will work for 10-12" fans.

Drywall channel for corners is used to create a frame for the filter. The frame is secured and sealed to the plenum, and the filter is taped into the frame. When the filter needs to be replaced, simply cut the tape and exchange dirty with new, then re-tape.

The drywall corner channeling cut, bent and sealed to the plenum.


Closeup of a cut, secured and sealed corner.


The HEPA filters I typically use.


Filter installed to plenum, and is now all taped up and ready to go.


Hope a great many of you try this and enjoy it. I've been doing it for 15+ years and love the difference. Be good to yourselves.
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Old 02-19-2020, 07:17 PM #2
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Excellent thread!!! Professional ops always use Hepa filtration but it is very nice to see a affordable version for the homegrower!
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Old 02-19-2020, 07:43 PM #3
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Great idea and construction. Thanks.
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Old 02-19-2020, 07:45 PM #4
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Both my veg & bloom tents have passive intakes via a HEPA filter. I have been doing it since day one
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Old 02-19-2020, 10:50 PM #5
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I've taken to putting carbon pads over the hepa filter to help keep house smells out of the intakes.

In the dry box intake, it goes carbon/hepa/carbon/damp wicking filter.

The water in the wicking filter still picks up a lot of crap!
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Old 02-25-2020, 04:51 AM #6
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Carbon is one I've considered a few times. I've taken a half-toke of fabric-softener cannabis before. Gack. Tents are not something you want in a fabric-softener laundry room. lol
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Old 02-25-2020, 09:56 AM #7
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wood is a poor choice for plenum making, going to grab then release the things you are trying to eliminate..

there are cheap solutions for high MERV filters.



and less cheap but properly engineered.



https://www.hvacquick.com/products/r...e-Filter-Boxes

once you get the particles filtered from the air UVC is the best way to kill molds and viruses and if you don't include some type of photocatalytic uvc in your system downstream from your filter you are missing the boat.




https://www.amazon.com/D200-PCO-phot.../dp/B0754C889Z

this is a $90 model you can grab at Amazon, I have one, but I built a more powerful one with 2 36watt bulbs using replacement screens from commercial filters.



my unit starts with a big carbon filter then fan then MERV then UVC and runs 24/7 scrubbing the sealed room.


this is a fancy weed model unit

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Old 02-25-2020, 10:24 AM #8
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in the spirit of DIY filtration you might try the latest from Wuhan..







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Old 02-25-2020, 07:01 PM #9
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Cute. As for wood, I'm not building microchips so it's ok. Appreciate the suggestions for when I have a budget.
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Old 02-26-2020, 09:44 AM #10
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Great idea. Douglas.

The mask pictures about wuhan are funny. Lol. But we never see that from news. Maybe they are made by PS.
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