i use the 8in. in-line duct fan BOOSTER i get them at home depot for cheap they keep my ecno 400hps with built in ballest plenty cool:thumbsup: go big now so you wont have to upgrade later....i wish i had that advice b4 i bought my light owell u live and learn right
caligrown82807 Reviewed by caligrown82807 on . Vent Question 4x4x4 grow box I was thinking about getting the 6" inline duct fans and using them as my intake and exaust for my newly built grow box. High Tech Garden has them and claims they move 250 cfm. I have a 400watts hps light. There will be on the intake side along with the inline duct fan a small swamp cooler that will double as a fan and inside the box blowing across the light toward the exause is two small clip fans 6" i think i the size. Would the 250 cfm inline duct fan be enough of an exaust or do I need to Rating: 5