Ok, who has some advice on heat issues. Here are the details:
-Box size approx. 5'x4'x5'
-2x4 and plywood construction (1/4" cabinet grade for walls and 3/4" for floor and ceiling.)
-Walls and floor covered in 6mil diamond mylar.
-ceiling is just mat white paint (painted the inside with mold/mildew resistant, protective paint.)
-Passive air intake 8"x8"
-Exhaust fan: 4" 195cfm w/ adjustable speed
-Lighting: quantum board LED
-wall mounted 9" circulation fan blowing across the top of the light.
By my calculations, the box is approx. 100cf so the Exhaust fan should be more than enough even counting the total of about 4ft ducting with 3 bends (hose is ceiling mounted inside box, run inside to pull from above and near the light.)
Ok, so here is the issue. The temperature inside is reading about 85F+ (~30C) and the only way to get it down to the 70-75 range is to dim the light to unacceptable levels. The ideas I have for lowering the heat are:
1. Install a 2nd Exhaust fan (same adjustable 195cfm with dryer ducting.) To vent more air
Or
2. Increase the size of the passive intake to 16"x16" to make it 4x the size of the exhaust.
Or
3. Do both.
Before I go chopping holes in walls though, does anyone have any suggestions or see anything I'm overlooking? I know using CO2 would allow the plants to take higher temps and I know an AC unit would be the easiest answer but I would prefer to get the temps in range without one.
-Box size approx. 5'x4'x5'
-2x4 and plywood construction (1/4" cabinet grade for walls and 3/4" for floor and ceiling.)
-Walls and floor covered in 6mil diamond mylar.
-ceiling is just mat white paint (painted the inside with mold/mildew resistant, protective paint.)
-Passive air intake 8"x8"
-Exhaust fan: 4" 195cfm w/ adjustable speed
-Lighting: quantum board LED
-wall mounted 9" circulation fan blowing across the top of the light.
By my calculations, the box is approx. 100cf so the Exhaust fan should be more than enough even counting the total of about 4ft ducting with 3 bends (hose is ceiling mounted inside box, run inside to pull from above and near the light.)
Ok, so here is the issue. The temperature inside is reading about 85F+ (~30C) and the only way to get it down to the 70-75 range is to dim the light to unacceptable levels. The ideas I have for lowering the heat are:
1. Install a 2nd Exhaust fan (same adjustable 195cfm with dryer ducting.) To vent more air
Or
2. Increase the size of the passive intake to 16"x16" to make it 4x the size of the exhaust.
Or
3. Do both.
Before I go chopping holes in walls though, does anyone have any suggestions or see anything I'm overlooking? I know using CO2 would allow the plants to take higher temps and I know an AC unit would be the easiest answer but I would prefer to get the temps in range without one.