DESCRIPTION Avoid diseases and pests in your plants by airing them out. Many plants do not tolerate high temperatures and high humidity. Thermovent is an automatic window opener in an aluminium-zinc coated steel look. Work on most greenhouse roof windows in our store. This model also comes with Planta Greenhouse Automatic Window Package. FEATURE Adjustable opening temperature of 60° F to 86° F Single springs Maximum opening of 17.71", Open force 15.43 Lbs Recommended for vents up to 30 lbs. Made in Denmark by Electro Galvanized Steel SUPPORT Manual Warranty: 2 Years How does a Greenhouse Autovent work?A strong metal tube contains a mineral wax that expands with heat. This pushes a piston which opens the auto vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong spring closes the vent and resets the piston. Your opener can be mounted all year round, however, your cylinder must be unscrewed by 1) Use of a heat source in your greenhouse 2) Winter storm, winter must be secured with the safety belt
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