how to attach ducting to a cool tube.

just got a 400w light with cool tube relfecter and it has 6" openings at each end. how should i go about setting this up. should i run the carbon filter then ducting to one end and then duct out the other side to the fan which will be pulling all of that out of the tent? then use on intake fan on the other side? im using a 2x3x5 foot ten and ive had temp problems. anyone with expirence with these would be greatly appreciated

you want to run your carbon filter/exhaust seperate from your cool tube. having seperate fans for the seperate functions makes it easier on maitnence, and temp control. if you run your exhaust through the cool tube you are only pulling the warm air across a warm bulb. The ideal option is to pull cool air from outside of the tent through the cool tube, over the bulb( I choose to pull across the light hardware first then the light, in my experience keeping that metal cool helps keep the air cool by the time it hits the bulb) and back out of the tent. also if you want to introduce co2 later on you will want the ability to turn the exhaust off but still keep the lights cool. and as far as the scrubber goes you always want to PULL the stale air through the filter not push. hope this helps.

if you run your exhaust through the cool tube you are only pulling the warm air across a warm bulb.

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How are you pulling warm air through tube if you drawing fresh cool air through the intake which is then being exhausted through light?

The air in the room should be cool, thats the point of cooling your light to keep room cool. The same air you would be pulling outside of the tent for the light is the same air coming through the intake to your tent.

To me with the exception if using Co2, this would be the optimal set up. Less fans and less ducting = less money and more space.

I run an intake fan w/ ducting from outside my closet into the light and then have an inline fan pulling that air out through ducting.....I have a separate inline fan that pulls air from the closet through a filter as my room exhaust....I.


if the light is sealed and you are pulling fresh air from outside through the fan I dont see the sense having you carbon filter there....youre gonna be scrubbing air that is already "clean".

KrAzY80 said:

How are you pulling warm air through tube if you drawing fresh cool air through the intake which is then being exhausted through light?

The air in the room should be cool, thats the point of cooling your light to keep room cool. The same air you would be pulling outside of the tent for the light is the same air coming through the intake to your tent.

To me with the exception if using Co2, this would be the optimal set up. Less fans and less ducting = less money and more space.

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this is true if your cool tube ducting is pulling outside air through the tube and venting it back out the tent. he is asking about hooking his scrubber up and using it as his exhaust and cool tube. with this method you are pulling the stale warm air that has risen to the top of the grow tent. pulling warm stale air over a warm light doesnt do much to cool the light down. Ive ran my exhaust and cool tubes both ways and have had more succses and ease of temperature control with seperate fans and ducting

I guess it depends on how much air you draw from exhaust...If its not enough to keep a good circulation through tent than the air would be warmer and bit stale.

I was just stating my logic on it. I am setting up a 4x4x8 grow area as we speak so I haven't actually tested this method, it just seems logical.

My room is in the furnace room so I am using my return off the downstairs furnace for my exhaust and carbon filter. I can regulate by blocking return vent as little or much as needed to maintain proper air flow.
I will have a passive intake. My basements stays at 68 degrees all year around so I will actually be using the heat from light to help out heating the basement.