Need help with heat issues. Need help ASAP

Rankdank

Rankdank

Member
(This is a hypothetical situation)

I'll try keeping this brief for less confusion. I have a 6'1/2 tall by 4foot wide 3 foot deep box. Has 11 CFLs (26w replaces 100w). 3 on each side and the rest from the top. 1 5'' exhaust fan (at the bottom). Lined with aluminum foil then mylar over top of it. 1 female plant 6 weeks into flower. Humidity at 25% and temp sits at 110-120. In recent weeks it sat at 40-50% and 75-80 degrees. Not sure why since the winter months why this temp has become a problem. Having less humidity wouldn't cause temps to rise right? Any advice on this situation would be welcome. I need to figure this out ASAP.
 
925Grow'N

925Grow'N

Active Member
Do you have a intake fan? Any pics of the space?

That sound very very hot, I wouldn't think the humidity would change the temp that much.

Also, maybe it's the dual layer of mylar and foil?

Hope things get better with the temp. situation.:mrgreen:
 
K21701

K21701

Active Member
Exhaust fan really should be at the top with a passive air intake at the bottom...How strong is your exhaust fan? I am having the opposite...my exhaust fan is so strong my highest temps with a 150w hps is 70-75!
 
NLXSK1

NLXSK1

Well-Known Member
K21701 said:
Exhaust fan really should be at the top with a passive air intake at the bottom...How strong is your exhaust fan? I am having the opposite...my exhaust fan is so strong my highest temps with a 150w hps is 70-75!
Click to expand...
What he said... You are trapping the hot air in the room.
 
darkdestruction420

darkdestruction420

Well-Known Member
i would definitely move the exhaust to the top, but im coming up blank on how it could of been fine before and in the 70-80's range and now out of nowhere it gets really hot and in the 110f-120f range. I really cant think of any reason, did the ambient temp of the room youve got it in shoot up suddenly?
 
BCBuddy420

BCBuddy420

Well-Known Member
switch to a 4inch vortex or similar type of inline fan, install it with a small amount of ducting up high in the box, that way you could even use a very small carbon device for odour if need be. You must take in fresh, clean, cool to slightly cool air IMO. Install a 4 inch (aswell) passive intake near the bottom, preferably coming from an outside source from ducting, you may wanna use your little 1.5 to assist the intake, if duct is long

With that wattage x CFM of that fan you should be okay. ps. use cheesecloth on your intake to be more sure of clean air
 
N

najanaja73

Member
yeah. way too hot. all else sounds good. concentrate on getting cool air in there. humidity is not a problem as long as you keep to no more than 50-60.
 
darkdestruction420

darkdestruction420

Well-Known Member
BCBuddy420 said:
switch to a 4inch vortex or similar type of inline fan, install it with a small amount of ducting up high in the box, that way you could even use a very small carbon device for odour if need be. You must take in fresh, clean, cool to slightly cool air IMO. Install a 4 inch (aswell) passive intake near the bottom, preferably coming from an outside source from ducting, you may wanna use your little 1.5 to assist the intake, if duct is long

With that wattage x CFM of that fan you should be okay. ps. use cheesecloth on your intake to be more sure of clean air
Click to expand...
Thats not a bad idea. I'd do that personally regardless of wether or not moving your current exhaust solves the problem. Youve got alot of space, have you thought of hid at all? you could do a 400w no problem, or get like a 250w hps to add to your current setup. I understand if for some reason you cant, but i figured i'd throw that out there. if not i'd up the cfl count. i had 24 42w in an area half that size so im sure w/a good exhaust fan adding those extra 9 should be no problem. youve got the right idea on the lighting and spreading it out, did you do a scrog or just lst?
 
Rankdank

Rankdank

Member
Thanks everyone, I figured out that in a hypothetical situation. Moving the exhaust fan worked. Your ideas helped over!
 
*BUDS

*BUDS

Well-Known Member
Rankdank said:
(This is a hypothetical situation)

I'll try keeping this brief for less confusion. I have a 6'1/2 tall by 4foot wide 3 foot deep box. Has 11 CFLs (26w replaces 100w). 3 on each side and the rest from the top. 1 5'' exhaust fan (at the bottom). Lined with aluminum foil then mylar over top of it. 1 female plant 6 weeks into flower. Humidity at 25% and temp sits at 110-120. In recent weeks it sat at 40-50% and 75-80 degrees. Not sure why since the winter months why this temp has become a problem. Having less humidity wouldn't cause temps to rise right? Any advice on this situation would be welcome. I need to figure this out ASAP.
Click to expand...
you will get crap heads at this temp. hum should be ok at 40, it needs cooler outside air sucked in and exausted out away from room.get some ducting and a fan. if not the cheap way ,just open it up (in light hours) and blow a couple of os fans straight in there, this will get it below 100 anyway.
 
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