Greenhouse Auto Vent Opener Automatic Window Opener Prevent hobby greenhouse overheating Auto Open/Closed.The greenhouse window opener does not consume any power, no batteries or electrical power needed Ideal for your greenhouse window, wall and hobby vents in higher wind situations. Suitable for Harmony, Hybrid, Mythos, Octave, Balance, Essence, Americana, Victory, Glory, Bella & Lean To Grow House 8x4 Silver Line, Inter Line, Multi Line Greenhouses with pre-assembled Roof Vent Starts opening between 59 - 77°F, Replaces manual vent arm Screw directly into polycarbonate panels, wood, or metal frames.
