Greenhouse Auto Window Opener | eBay, Bayliss XL Auto Vent Opener. Wax within the cylinder expands when it’s hot, pushing a piston to open the window and contracting in cooler temperatures to close the window again.
High Tunnel Roof Vent with Opener – GardenTrends, The Ken-Bar High Tunnel Roof Vent installs directly into the film covering of high tunnels with no additional framing required. Its unique clamshell design prevents water intrusion while providing 2.5 ft of ventilation space. Weighing only 8.5 lbs., the Roof Vent uses standard wire lock and channel to attach securely t
Greenhouses | Costco, Find a great collection of Greenhouses at Costco. Enjoy low warehouse prices on name-brand Greenhouses products.