The greenhouse has front and rear double Dutch doors, and 4 roof windows with automatic opens. I also wanted an automatic ventilation system, but I didn't buy it from the GH company. I bought it from a distributor of the manufacturer that the GH company buys the system from. I saved just about $200 by doing it this way.
J&D Manufacturing Shutter Mount Direct Drive Wall Exhaust Fan (20", 1/3 HP, 3,126 CFM @ 0" S.P., 115/230V, 1 Ph. - Single/Variable Speed with 10' Cord, 115 Volts
J&D Manufacturing Motorized Aluminum Intake Commercial and Agricultural Grade Power Shutter (24" x 24" Power Shutter with 10' Cord, 115 Volts)
Single Stage Moisture Proof (Piggy Back) Thermostat Control w/Cord
