Hobby Greenhouse Vent Openers - BC Greenhouse Builders

Hobby Greenhouse Vent Openers

Have you been curious to know how our automatic greenhouse vent openers work? Inside the piston, there is a cylinder of wax. When the temperature increases, the wax expands and pushes the vent open. Often on larger greenhouses you will see the roof vent openers open at different times of the day based on the location of the sun. Brilliant!!