Ventilation ducting is used to vent air from the grow space. The lights of indoor gardens generate a large amount of heat, and too much heat will kill plants quickly. Ventilation ducting and fans are used to pull the overheated air out of the room. Venting the grow space also helps to keep the air circulating, which ensures a steady supply of fresh air coming in and prevents moisture from building up. The ducting is available as a flexible tube, which makes it easy to shape it to the space.