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Hello again people, anyone have an idea, of a formula, or if i can get away with a 6" fan (lets say 6" can fan with carbon scrubber) for 3 600w HPS with digital ballasts?

He would get the biggest fan if he could, but venting size is the problem! it's only 6" in and 6" out!

How about building a ceiling in the shed then you can stick an exhaust fan in that which would help in two ways, first, it would reduce the amount of heat radiated into the shed from the tin roof and if you insulate it keep the shed warmer in the Chilly months! if the ceiling can't be flat run...

Hello Everyone, this is my first post (I think) so have a read and see if you can help! Cause I'm currently doing this ===> :wall: I am in the middle of designing a 'Friends' indoor vegetable grow room! and to use the method regularly seen, recommended, and explained on RIU. One would simply...