a 5" is well ott for that space a decent 4" is more than enough
for sure, but 5" fans with a low/high speed selector such as the one I suggested will almost always be quieter at low than 4" fans. Also I dont think ive ever seen a 4" cool tube for sale at grow shops. To the OP best of luck with the grow man, be sure to update us on your final setup and first grow


Well done keep it up
