Automatic Vent Opener Replacement Cylinder

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This product is a replacement cylinder to fix an automatic vent opener for the GardenHouse greenhouse. Automatic vent operators on the roof and base vents require no electricity or batteries. The vent operator contains a paraffin (wax) that expands when the temperature reaches about 65°F, pushing the vent open to its fully opened position at about 85°F. The operator’s springs draw each vent closed as it cools and the paraffin contracts. It is adjustable within approximately 5°F and easily detachable for manual operation. Please allow two weeks for delivery. Only available for shipment to continental U.S.A addresses. Show more