Gigavent - Automatic Greenhouse Vent Opener up to 65 Lbs Premium Gigavent Solar Vent Opener can lift up to 65 lbs Adjustable for different opening heights and mountable two different ways, taking up as little space as possible within your greenhouse. The volume-expanding wax within the hydraulic cylinder will endure any temperature (hot or freezing), working independently of the power grid for continuous temperature monitoring. Black and silver, high quality, all metal construction 2 Year Warranty with Agriculture Solutions LLC