I also highly recommend going with a 6" duct air-cooled. Way more air flow is possible, and less noise than a 4" for the same cfm flow.
stinkyattic Reviewed by stinkyattic on . Your favorite enclosed hood My enclosed hood isn't really. It is riveted together and leaks all over the place. The glass panel doesn't seal either. I want a new one, does anyone have a suggestion or favorite? Looking for a small one to hold a 600W HPS, with 6 inch openings. Rating: 5