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Bayliss, based in Ashbourne in th UK, have been manufacturing autovents since 1964 they are a family business with an excellent reputation for the quality and reliability of their products.
The basic principal of all the Bayliss automatic vent openers is the same, within each autovent is a strong metal power cylinder that contains a mineral wax that expands with the heat. This cylinder pushes a piston, opening your greenhouse window.
So as the temperature rises the window automatically opens, as the temperature falls, the window closes.
Made from stainless steel, brass and aluminium, the Bayliss automatic vent openers are designed to provide you with many years or service.