600w scrog

I would like the knowledge of some in the know or with experience with heat issues..

I have tried basing my fans in the grow room a built in cupboard upstairs about 2 meter square..little less maybe, which is not good so they have been relocated 3 meters away in the loft in wooden boxes hung from bungee cords.

I have a 600w dimmable ballast with 6'' cool tube, reducers and a 5'' fan 280 cfm ''tt'' and acoustic ducting also a speed controller.
The cool tube will be in the center of cupboard with a 90 bend either end.. I have no choice..
going up a meter then another 90 bend and finally 3 meter run to the fan which will blow air through the tube and straight out of the other bit of duct from cool tube.

Also I have 4'' 180 cfm fan and carbon filter expelling air from the top of the room blowing through the carbon filter to save on noise in the loft acting like a silencer.
There is a small inline bathroom fan {duct type} bringing air in to the room..
These are controlled by primair temperature controller.

Is this going to keep the temperature at a decent level??
Any thoughts

At the moment I am bringing the babies up in a pc case with 105w cfl,
The type for photography.
 
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