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3 x THERMOFOR AUTOMATIC GREENHOUSE WINDOW OPENERS (AUTOVENT) Automatically opens and closes your greenhouse window as the temperature changes. Complete kit, ready to install with easy to follow instructions. Fits most greenhouses. If you have one of the "trapped polycarbonate" type of greenhouse which are currently being sold on the internet there is nothing for the clamps to fit onto and these units will not be suitable for you unless you are prepared to modify your greenhouse in some way, we have known people drill through the polycarb and frame to fit autovents when the clamps are not usable. This opener is the latest in a line of THERMOFOR® roof vent openers designed and supplied over the past 50 years. This model is an attractive cost effective unit with a unique opening action, ensuring a smooth twist free operation, and with the cylinder mounted within the bracket to eliminate projection in the greenhouse. It is finished in a durable polyester powder coating and is corrosion resistant throughout. Easily fitted to Aluminium and wooden greenhouses it will lift up to 7kg (15.45 lbs), i.e a vent weighing up to 14kg (glass area not exceeding 0.75m² in an aluminium frame), with a maximum opening of 35cm (14 inches).Manufactured in the UK by a company with 50 years experience of these vents - please do not compare with cheap far east copies. We also stock other autovent models from Thermofor - the side louvre opener and a heavy duty double spring roof vent model for use in exposed locations, spare cylinders for these are available in our ebay shop. We also supply Bayliss XL, Standard Mk. 7, Triple Spring Mk. 7, Mk. 7 HYDRAULICHECK and the Mk. 7 Super vent openers as well as spare cylinders for all the autovents we sell. De - Automatische entlüftung Fürgewächshäuser Please look at our other items in our ebay shop
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