So I was wondering....has anybody really tried to cool the air in the grow room as it exits the room? I've just been thinking where I am venting ANY heat into ANY other spot could be too noticeable. During the winter I plan to have a valve where the heated air (desmelled) can be vented into an area to warm the area up when I'm chillin in the area outside the grow, but when not there the air would be vented outside.

My idea - have the exhaust fan blowing into a PVC pipe big enough to handle the air flow. At one point there is a T joint, one way leading to the other room, one leading outside. The one going outside would enter a 30 gallon drum filled 1/3 the way with water and engine coolant first where the air would bubble up through the mixture and then out another pipe to the outside.

Would this provide enough cooling to keep from showing a "noticeable" heat exhaust during winter?

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G'day... Ive been cooling the air out of my under ground room using a box (1 metre by 2 metres) made of wood and lined with garden plastic (The black stuff) and putting 2 or 3 partitions in the box using fine chicken wire and activated coal chunks and between the partitions put a fine mist garden sprinkler ( one per partition ) . So the air comes throu the box .. goes throu the first divide which is wet from the sprinkler then throu the second.. It works on the same princiable as a water evaporator airconditioner. you can never make the box to big.. the bigger the better.. you can even but an exhaust fan on the exit of the box to help the air throu.. If you can not find activated coal normal coal will do but wash it extremely well (both activated or not)
Hope this helps you..

Do you think diffusing (think of a diffuser stem from a bong) into car coolant and water would do the same thing though? It'd only be cooling the air from the 12/12 room the veg room would be under cfls so not much heat to remove.

I think it would work. But you would need a hella good fan to push the air into the water.

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Thinking that a small fan mounted to the drum could help pull the air out of the drum...dont think I could get it air tight enough to change pressure enough to cause it to implode.

blown...

i dont think you have to go that far man, i mean your only using cfls the heat is not that bad and also there is heat pouring out of every home in american from the dryer vent so I wouldnt worry.

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"They must find it difficult...Those who have taken authority as the truth, rather than the truth as authority"

#1) will have 400W HPS in 12/12 room, just CFLS in veg room.
#2) Not inside a house, therefore different...add in direct sunlight on the "building", temps build up quick

(Look up my other post about my new grow room in the making)

I think you would need one hellava pump to force the air into the drum.. even if you stick a hose into a drum of water and blow throu it.. its hard.. I couldnt imagine a pump doing it... thinking of the size of the pipe you are going to be using for your exit air... build the box i mentioned before... its simple and it works

The PVC entering the drum (mind you this will only be 1/3 filled) would have a squirrel cage style fan attached to it pushing the air through. Now I dont know about you, but I think it'd have the force to move the air through, but maybe I'm wrong.

Having the water bubble through will require all sorts of valves and stuff to avoid liquid backlflowing.

Why don't you just make the pipe that goes outside a spiral or something similar, that spiralls THROUGH the drum, similar to a lab condenser, more specifically what is called a "graham condenser".

http://en.wikipedia.org/wiki/Condenser_%28laboratory%29