Questions on venting my closet...

Hey ya'll got a couple questions about venting my closet... I am growing with a DWC in a closet in my spare bedroom. The closet has those accordion style doors so they do not seal all the way. It is 80 cubic feet and I was wondering how to vent? I have a 400W HPS up right now with an extra 400 W HPS in case I need it. The hoods are not vented. What size fan would you recommend? Do I run it non-stop or put it on a thermostat? Thanks!

i would just vent directly off the llight (hood) with a 4in inline duct fan (you can get it at any homedepot). then find a way to duct it out of your space otherwise your just circulating hot air around your closet. Also if you have those accordian doors you will need to find a way to get that light tight for flowering (maybe cover in mylar) you can't risk having any light seaping into the room during lights out. ANd of course get atleast one oscillating fan in there.