Yea well my plan was to run a 2ft duct fan intake from outside the house to the closet and have the vent, heat the air into the wall(80cfm), now will this work? Im mean for 1, the outside temp this time of season is about 20-45%F (northern east)the duct fan will be 80cfm my grow box closet is 2x4x7, I have a 400wMH and a 400hps for flowering? 2. will the hot air vent be ok in my walls and will that take care of the oder as well? So far so good anyway for now but I want to plan my ducting system and get things moving along so I can have my closet door closed. PLease Respond if you know