so ive followed all the guidlines, but ill jot them down and see what you guys think about it.

I have a 250cfm inline exhaust fan venting out the top of my grow room, which is 4x4x6. i have a 50cfm fan as intake into the room, its sucking air from an out side vent. i have a 16inch oscalting fan in there. im using a 600w light. but temps are staying aorund 88 and hum is 42. i would love for it to be around 82 degress without having to leave the door open. i live in cali and its hot anyways, but it on ave is like 75 degress. my grow room is built in my garage. my room is built out of plywood. but the inside is lined with a foil like material, its used for sheeting a roof and with the foil side that faces down to insulation. so i dont know if the wood is insulated, but id be a lot happier if the temp was lower and the door could stay shut.

so what do you guys think i should do.... add another exhaust fan. i dont have ac and wouldnt want to use it anyways to cut cost.

Let me know, i greatly appreciate it. ive been fighting this problem for awhile now.

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yeah, that foil material might be jackin' up the temps. Might want to get some mylar in there. If need be, you might need to go down to a 400W setup. Remember, you do what you have to.

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get an air cooled reflector if you don't already have one and circulate straight through the lamp your heat won't have much chance to enter the environment that way. More exhaust may work but 250cfm should be fine. Do you know what the temp of the air coming in through the vent is? Probably won't matter but worth a shot to look at.

Heres some pics of my set up. you can see the inline exhaust fan on the right wall at the back of it. i use the black oscalating fan when it gets too hot in there to add extra movement of air. i also have the reflector with the holes in it.

let me know what you think

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To max out your space and helps with the mold too, is SOG might wanna lower the black fan to have the air circlating on top and bottom. Looks good and similar! how tall are they about 2 feet at the highest?

You only have a 50cfm fan bringing fresh air in. You are nowhere near the capacity of your exhaust fan. Is there a way to bring more fresh air in? Your exhaust should be fine but a 50cfm fan at the end of a piece of ductwork is not bringing much fresh air in.

good pt on lowering the fan, ill do that tonight. they are on ave 1.5 - 2 inches tall.

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i have any extra 90cfm that i replaced with the 250cfm. i could switch the 90 for the 50 or i guess i could buy another 250 or a bit smaller for the intake. what is addaquete? or what is recomended to match the 250 exhaust fan.

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It is more complicated than that.

First of all, what you are using in the inside of your cabinet is insulation. You do not want to be trying to keep the heat inside your cabinet. In between grows I would recommend either painting the inside white or using mylar. Let the plywood/osb board breath and help with some of the heat.

Now, how far is the intake ductwork from your grow room and what size diameter is the intake hole?

How about the output?

wouldnt painting it still keep it insulated, isnt that what the foil backing is doing? what if i tryed pulling it off. i noticed when i put duct tape on it and try to remove it, it comes off. same deal with the mylar right, even though its in the inside of the osb heat cant escape through it.. does that make sense?

the intake is screwed right to the outside of the grow room, with a 4inch hole that has the duct pipe running right in.

the output goes right out the top of my grow room. the duct is 4 inch as well.

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