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What if from the 12" duct the exit hole is only 8"? How much wg inches would i possibly be looking at?

If I were to put 2 x 8" cans fan onto a 8 x 8 x 12" wye forcing air out the 12" side, how much static pressure would i be dealing with? Would this setup be inefficient? I need 1 fan to cool my lights and the other will be used to create negative pressure (outside of the grow room).

purple kush

How much longer? How much longer? How much longer? Taken on day 56

:wall: :cuss:

How much longer guys...

Im on day 56

What strain do you guys think this is? How much longer does it have before the trichs start turning amber? Platinum bubba How much longer does it have before the trichs start turning amber? Alien OG How much longer does it have before the trichs start turning amber? Thanks in advance guys!

if heat is not an issue thats fine. and you've got deficiencies..

Thanks Burr you are quite informative.

..... i've read the thread. this is why i'm asking if anyone else is having issues with PH dropping. I'm using 3:1 bloom, 2ml mag pro, 5ml pro-tek at 600 ppm inr RO, ph lands at 5.8 when first mixing nutes. drops to 4.9 in a few days. silly child, im going to assume that the res is too small.

does anyone have issues with dyna gro lowering ph over time?

quick question. when do you start using 1-3-2? when stretch has stopped? or when the lights have been turned to 12/12? so during the stretch could i use mayb foliage pro at 3-1-2 ?

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Hmm wouldn't this make your room very very hot during the summer time?

I have a quick ventilation question. I'm wondering which would be more efficient. 1. Venting scrubbed air outside which will be connected to my exhaust vent for my lights. 2. Venting scrubbed air back into the a/c ed room. Intake will be vented from a room, which will be a/c ed. This...

thanks guys

I recently purchased a Profilter carbon filter. When I opened the package it had some charcoal leaking from the inside. This even stained the prefilter. Is this normal?

thank u :)

Hey guys, I need some help with duct sizing.. 1). I have 6" cool tubes.. how many cfms can be pushed through? I've read that 6" metal ducts will allow 85-100 cfm.. but it does not state the distance of the duct. If the distance is short.. can more cfms be pushed through? 2). Should i...