Heat-What I am doing wrong?

[sirsmokealot23]

Well I started to get heat problems with temps around 90 so I decided to add a 500 cfm exhaust fan at the top of my room to take out the heat. The problem is that it only made the temps go down like 2 degrees. Is this because I have no intake air or is my fan not big enough? My room is less than 800 sq ft. I have a 1000w light with a 180 cfm exhasut fan connected to it and the duct is very hot so I know its working. Instead of hooking up the new 500 cfm fan at the top of my room should I switch it out with the 180 cfm connected to the light? Will any of this help out my temps get at least down to the low 80's? Sorry I got so many questions...I'm just not sure to do with the items I have. Thanks for your time. Also I got some 5-10 in. plants and was wondering how far to put them away from the 1000w mh light? I got them 3 and a half feet away currently.

sirsmokealot23 Reviewed by sirsmokealot23 on 08-22-2008. Heat-What I am doing wrong? Well I started to get heat problems with temps around 90 so I decided to add a 500 cfm exhaust fan at the top of my room to take out the heat. The problem is that it only made the temps go down like 2 degrees. Is this because I have no intake air or is my fan not big enough? My room is less than 800 sq ft. I have a 1000w light with a 180 cfm exhasut fan connected to it and the duct is very hot so I know its working. Instead of hooking up the new 500 cfm fan at the top of my room should I switch Rating: 5

[Dreadscale]

welcome sirsmokealot23

Is your 1000w enclosed ,with an intake ported from outside of the room, and the exaust also outside?
Do you have passive air intake lower in the room than your exaust , that should be removing heated air at the top?

If you got a photo or a sketch of your set up that would help a bit for more accurate answers.

Good Luck

[McDanger]

Less than 800sf, that is like 20X40, or do you mean 80sf. you need at least passive intake down low, then if you put your bigger fan on the light ducted out of the room you should be able to get it down. What is the ambient temp outside the room?

[TheMetal1]

I can tell you this for sure... you need some sort of intake to circulate fresh air. Plain and simple... should drop your temps considerably.

Have you ever tried to suck through a clogged bowl? Imagine that the passive intake hole is acting as your poking tool. Clear up that air path so your babies can breeeeeeathe. :stoned:

[McDanger]

Great example, just like taking your thumb off the carb.

[stinkyattic]

IF your light is air-coolable, I would swap out your fans so that big one is on the light. Also consider insulating the duct from the light to the fan.
Remove all obstructions from the passive intake and make it twice as big as the total exhaust hole size, including the exhaust from your light.
Make sure the exhaust from the light is not going into the space that the intake is pulling from. Send it into a different room.
A/C the room where your intake is coming from.

[sirsmokealot23]

first off thanks for the response Dreadscale. I have an exhaust from the air cooled reflecter but I don't have intake into it. Will that make a big different if I put that on? The only other problem is that I am out of holes to get some outside air. What if I set up an intake into my hood and then that would lead to the outside through the exhaust. Also just to add I dont currently pull air from anywhere but I do have a 3 by 3 hole into my space. I'm doing this grow in an attic so the spot leading up is always open. Thanks again for your help.

[sirsmokealot23]

Sorry I meant 800 cu ft. I have a 10 x 10 room that is 8 ft high. Like I mentioned to Dreadscale this grow is in a attic and the temps outside are in the high 80's and low 90's. Inside my house the temps are in the low high 70's low 80's. I'll switch my fan today and see what happens. Thanks for the help.

[sirsmokealot23]

Hey TheMetal1. Thanks for responding. I do have a 3 x 3 port open. Do you think this is good enough or do I actually have to pull the air in? I totally understand the clogged bowl example. Thanks. Also the air is my house is only high 70's and low 80's will this air be cool enough to even out with the heat if I do pull it in. Just wondering because I read on a forum a bit ago that if you aren't sucking a/c air in then there is no point because the difference is little if any. Thanks.

[sirsmokealot23]

Stinkyattic- today I will switch out my fans and add some insulation around the duct. Thanks for the tips! I had a hard time understand what "Remove all obstructions from the passive intake and make it twice as big as the total exhaust hole size, including the exhaust from your light." Maybe I am just stupid but it just didn't click to me. All of my exhaust goes to the outside of my house and all my intake comes through the entry space into the attic (grow room) from the house. Should I be pulling and sending it to some place else? I wouldn't do it like this if I had a spare room to grow in but I'm stick in an attic. Thanks again for your help and time.