It doesn't have to be completely silent....I'm just looking for something to use in my first ever cab grow.
What would you recommend??.....I've been reading for weeks now trying to get a design together....I built a rubbermaid setup but feel that sound and heat are both an issue with my buddy's loud and hot self-enclosed 250mh.....plus the fact that I feel its already a pain in the ass to deal with stacking them and I don't even have anything going in there besides for the light.

How do all the cool-tubes I see everywhere work?? I picked up some ducting and a 4" inline duct fan....hoping to cool-tube to a carbon-scrubber if that's possible?

SHould I just ditch the 250mh and try to make one of these cool-tube things?? Is there a good tutorial you can recommend?? The bulb in the 250mh is an AgroSun which is supposedly better than a plain ole MH.....anyway I could save it and use it in a cool tube design??

Sorry for all the questions.....I'm a n00b

Thanks again