Greenhouse and Agricultural Ventilation Greenhouse and Agricultural Ventilation Single end wall vent on nexus greenhouse Greenhouse ventilation means many things to different people. To some it is air conditioning with fan and pad cooling. With others it is natural ventilation, using roll-up sidewalls, automatic ventilators for roof, sides and ends. One popular method is the Fan-Jet exhaust/fan ventilation system. Other methods use exhaust fan with automatic or motorized shutters. Some ventilation is the use of insect or predator natural ventilation with air moving through the screen by natural wind action. Ventilation systems are also used to protect greenhouses during cold temperatures to prevent cold air from infiltrating into the house. Fans Motorized Shutters Air Conditioning Insect Screen Pads Roll-up Curtain Walls Vent Controllers Poly-Vent Rack & Pinion Double side wall vent use Vents are used for both natural and mechanical ventilation systems. They include: sidewall vents roof vents gutter vents wall shutters inflatable side vents rollup sidewalls Fan-Jet systems: See Fan-Jet section under Fans. Still an outstanding option not only for ventilation but also for internal air circulation, better than HAF fans in many cases and also for heat distribution. Fanjets are three stage environmental control. Special systems are designed and available for a wide variety of uses in agricultural and greenhouse buildings.