i have a closet 2m x 1m with a 600w hps

i got 1 fan at the bottom of the cabbinet blowing air in --> 100ø m

and i got 1 fan blowing air out thru the filter --> 125ø m

it worked and works pretty well actully, i did 6x blueberry in with the 600w hps.. at really hot days i had some problems ye.. got up to 30-32C but it didnt really hurt the plants much.. but again, that was only on rly hot summer days ya