you should be fine with using the air from underneath the house.
as it will be ventilated from vents around the house and will give you a steady supply of clean fresh air.:thumbsup:
phixion Reviewed by phixion on . ? about venting from crawlspace to attic If a person wanted to set up a 4' X 5' flowering room, using a 1000W HPS (w/ cooltube) would they be able to bring in "fresh" air from underneath the house, from the 2ft crawlspace, through the cool tube, and up to the attic? The reason I ask is b/c the air under most houses is kinda stale, but it is very cool, just wondering if you start moving the air if it would start becoming more "fresh". There is also concern with a little bit of moisture from under there, which they are trying to get Rating: 5