10x10 4kw its toooo hot

i have a 10x10x7 tent
4 x 1000whps
8" air cooled reflectors

hole in tent <- 6" fan <- phresh filter
hole in tent <- 8" fan <- lights <- phresh filter

Room temp is 75f. Tent quickly goes to 87f with lights on.
Running 3 ballasts at 75% (dimmable) temps stay around 83f.

So since fucking with that ducting is such a pita before I start I thought I'd get suggestions.

if my calculations are correct 10x10x7=700 cubic feet.
700/3 233cfm worth of fans to exchange the air every 3 minutes.

So with that my single 6" fan should be able to vent the tent itself every three minutes. Should I get rid of the 8" filter and just run a loop through the lights and back out? The filter is rated to the fan so I wouldnt think it was slowing things down.

yes you should use an independant fan for cooling, filter cause pressure lost and it reduce your cfm. 8'' fan is a bit too small for 4 1000W, you should check atleast for 10''. always try to have 250-300cfm of cool air per 1000w. your light are in-line or parallele? if inline you should check for a 12''.

I run 4kw in a room about the same size (mine's a bit larger) and I use 2 6" inline fans to remove air from the room. I use a big ass Phresh filter with Y ducting, so one fan pulls air through two 1000's (XXXL hoods, with 6" ports). I use an 8" inline fan with a dust shroom filter to pull fresh air into the room. Now here's the kicker....I also use an EdgeStar stand alone air conditioner in the room. I keep it on 72 degrees when the lights are on. This morning, at the end of a 12 hr. light cycle, the temp. was 73.9 F at canopy level. When it's really warm outside it may get up to 78-79 at canopy level. I guess what I'm saying is that you need to invest a few hundred dollars and get an air conditioner.

no offense but im not putting an AC in a tent inside an air conditioned room. Seems like that should be unnecessary.
I have a 14" fan as well. So maybe ill use that to pull air through the lights since I dont have a filter for it. And then just have the 6" and 8" exhausting the tent through the filters.

No worries. My room has a shit load of air movement, but was still too hot during the warm months. I added an air conditioner, that is also a dehumidifier for the dark period late in flower, and a heater for when it's really cold during the winter. It makes my room's environmental conditions optimal in any number of situations. It was the perfect answer for me. I'm sure there's other answers. I just went with the easiest, most obvious one.

Well one good thing about using a local hydro shop instead of online is I went by and gave him my sob story and he gave me a 8" fan to take home and test. If it works Ill buy it if it doesnt ill bring it back. I asked if he wanted a credit card deposit but he didnt.

So ill give that a shot today.

I have a good HVAC guy so if it comes down to it Ill have him route one of the AC vents directly into the tent.

I also just ordered a dehumi because I got some rot in my colas last run. not sure if it was during grow or cure but Im not taking any chances. Funny thing is with all the lights and fans cranking in that tent the RH drops to like 30% anyway. But it will help with the lights off dew point.

you could provide better cooling if you use the 8 inch fan to blow cold air through the cool tubes
instead of sucking warm air through them from the grow space
if you can get the ducting near a source of cool air, open window etc, it makes a huge difference
blowing this cold outside air through the tubes in the winter it is almost as good as blowing an a/c directly through the tubes
AC costs so much to run though best avoided when possible

use your 6 inch inlet fan, as the outlet fan for the whole space mount that high
you can have a passive inlet make this bigger 8-10 inch instead of 6

peace

try this set up. very effective.your air intake should be at the bottom of your tent and your exhaust at the top. Your exhaust must be higher cfm than intake if you want to keep a negative air pressure.

interesting. instead of 2 sucker fans, use one as a blower. Ill give it a shot.