if you do what your first drawing was turn it around so you pull air off the ground and exhaust it through the roof. the air on your roof will be warmer than the air on the ground. unless its concrete or asphalt then it probably doesnt matter.
CJBHM52 Reviewed by CJBHM52 on . Ventilation? help me! If you saw on my "temp increasing" my grow room temp has been increasing. i have direct ventilation from out side right now ( pics below) but i want to use venting pipes to air cool my lights and so i can start using CO2. i put all my plants under one light (1000w mh) instead of two and turned the other one off. this decreased my temp by almost 10 F and now they are around 75F. I need to know if i should have one pipe going through both lights and sucking air from the ceiling or if i should Rating: 5