How to Ventilate 4'x3'x6' tent

mauichronic808

mauichronic808

Well-Known Member
Currently I have air intake and exhaust fans. Exhaust is a bigger, more powerful fan that pumps about 440 cfm and the air intake is much smaller (wanted to try something cheaper) and it pumps about 260 cfm. My problem is that I'm getting temps in the tent that exceed 94 degrees which is way too hi, I know. I have a 600w hps in currently and was wondering if my best bet was to switch to a 600w LED panel to decrease heat emission or should I upgrade my air intake fan to something more substantial that would pull in air from the room (about 68 degrees in the room on average).
 
V256.420

V256.420

Well-Known Member
Get rid of the intake fan. It's actually slowing you down. Get a 5 foot piece of duct and let it hang down from the opening in one of the tent sides. Tighten it up and let that be your intake.

I connect my exhaust fan right to my hood and place that on top of a carbon filter. Kill two birds with one stone. All passive intake. My carbon filter cfm is double that of my exhaust. Totally stops any smell.

Outside tent temp is 78. Inside is 82.

600 watt LED is still 600 watts.
 
mauichronic808

mauichronic808

Well-Known Member
V256.420 said:
Get rid of the intake fan. It's actually slowing you down. Get a 5 foot piece of duct and let it hang down from the opening in one of the tent sides. Tighten it up and let that be your intake.

I connect my exhaust fan right to my hood and place that on top of a carbon filter. Kill two birds with one stone. All passive intake. My carbon filter cfm is double that of my exhaust. Totally stops any smell.

Outside tent temp is 78. Inside is 82.

600 watt LED is still 600 watts.
Click to expand...
But watts don't necessarily correlate to heat, do they? I'm used to growing outdoor so I'm still learning the whole watts, volts, amps thing in terms of sustaining a grow and maintaining consistent numbers.
My current hood is just a reflective hood that is open. I think I need one that is sealed closed with an air-out option like yours.
Currently, my air exhaust out fan is inside the tent connected to a carbon filter, there is ducting leading the old air out.
 
greg nr

greg nr

Well-Known Member
Yes, a watt is a watt. Same heat for both led and hid. BUT.....

Because the efficacy is so much higher with led, you need fewer watts. I think the numbers being posted are ~50w/sq ft for hid, and 35 for led. So for the same light, led will be cooler. Also, I think the LED drivers are more efficient than hid ballasts, but that could just be a mindbug....

That's why people say they don't have heat issues with LED's, not that watt for watt they run cooler.
 
mauichronic808

mauichronic808

Well-Known Member
Got my Cool Tube in and have temps way down but still at about 85º F. I think this a good enough temp and if I open the windows in the room the ambient temp of the room will drop and my fans can pull in cooler air. My only worry is that when the lights are off, the temps will drop too low.
 
OldMedUser

OldMedUser

Well-Known Member
mauichronic808 said:
Got my Cool Tube in and have temps way down but still at about 85º F. I think this a good enough temp and if I open the windows in the room the ambient temp of the room will drop and my fans can pull in cooler air. My only worry is that when the lights are off, the temps will drop too low.
Click to expand...
Do you have a temp/rh controller on your exhaust fan? Then your exhaust fan will only come on when it's told to. A speed controller is good too so the air exchange is more gradual and tightens up that temperature/rh window to keep things in the zone better.

I also have a heater in my grow room on a thermostat made for baseboard heaters so temps can't drop to far at night.

:peace:
 
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