thanks slipon my room is about 1.3meters by 3 meters roughly
1,3x3 meters = 3,3 squar meters .. is it sealing hights ? 2,2 meter or so ?
then you have around +6 room meters ..
a littel more then me .. I run a 600W HPS in ther with a 6 inch ventilation that can empty the room in less then 2 minuts
try to calculate it for yourself:
http://cheaphydroponics.com/Merchant2/cfmcalc.htm
if you have low temps and/or have a cool tube or just run tubes/CLFs .. you might be able to get away with emptying the room in 5 minutes ..
most likely not .. more like 1-3 minuts .. 1 if you live in a place where you got high temps .. unless you of course run a AC in there ..
BTW
I have a cool hood now .. before I had problems keeping the temps under 30C .. actually often 32-34C at summer .. now with the cool hood and summer over I can keep it around them perfect 26-28C