by Jorge Cervantes
Air Ducting
Vent fans are usually attached to ducting to direct air out of the grow room. Flexible ducting is easier to use than rigid ducting. Keep the ducting straight and short. Long runs of ducting cause less air to be expelled and at a slower rate. When ducting turns more than 30 degrees, air movement declines and less air exits the other end.
Direct used grow room air out a chimney, roof vent, or window so that it does nt bother neighbors with the telltale smell of a lush marijuana garden.