right my space in wich i want to grow is sorted, got me nft, me lights but not yet srted any extraction out, if im useing 650 watts of hps,, how big of an extraction am i gonna need. my space im thinking of is about 4 ft wide 6ft long and 10 ft high, its indoors and isnt really a cold room. and also if any1 knows of a cheapish place to get 1 from it would be much appreiciated.

alright mate, the uk420 sells extraction fans pretty cheap, discreet and swift delivery

check it out

TM

This time of year you'll get away with a 5" but come the summer you'll suffer, i'de go for the 6" myself......

RAZ