Still too hot with cooltube in closet...?

Even with my cooltube, overnight my closet peaks at 84.0... I have 300cfm pulling through 400w and it's cool to the touch.

I'm starting to think it's my passive air intake size.

My exhaust is 4x4", and I have 2 passive intakes about 2x2 each. My closet door will suck itself shut if I leave it cracked.

Have to be intakes, right? The door shutting itself makes me thing so...?

84 is not bad at all. That's kinda what happens when you run a 400 in a small tent. Mine does the same with an 400w air cooled hood. Won't do any real damage. Enjoy the new light, and keep on growing.

i have a 400w in a closet, it gets up to 84-86 everyday, still get good results, its when ur in the 90's that u should worry

it was only getting to like 86ish with an open wing...something is up, the cooltube should make a bigger difference than that... I've checked my ducting is air-tight...

do u have a fan sucking air from a cooler places? like next room, or outdoor?

it's always an intake temp of 70-72F (21-22C) exhaust temp is like 95-110F

edit: passive air intake

It's got to be your intakes. My 400w closet gets 10f higher than ambient with a 70 cfm fan. Your closet shouldn't go more than 5 or so degrees above intake temps and definitely shouldn't be above 80. Can you open up more intakes? Maybe a duct booster to help existing ones?

I added a 4" 80cfm booster fan as an intake...overnight the peak was 81, so a peak temp reduction of 3F. Pretty good!

I'm thinking of upping it to a 6" booster fan intake, hopefully that'll reduce it further. I guess when your passive intake holes aren't big enough, you can compensate with forced intake!

This really is something you have to tinker with... I know 81 is cool, but I'd like to stay in the 72-77 range, I want it as perfect as possible for a rookie...