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Reliable, quality built anodised aluminum automatic window opener for greenhouses. Clamps onto most aluminum greenhouse vents no need for drilling. Greenhouse Autovents are essential for ventilation during hotter months. Auto vent openers and spares from Bayliss, Halls, Elite and Vitavia.Essential for greenhouse growing, Bayliss autovents automatically open and close hinged vents providing accurate and continuous ventilation around the clock If you are pleased with your Bayliss. Autovent, please tell others. If not, please tell us. Preparing the unit for fitting. 1. Remove the Autovent unit and Bayliss Solar Powered Vent Opener from BC Greenhouse Builders help to create the perfect temperature for your greenhouse plants. The Bayliss Mk7 Greenhouse Autovent is approximately 29cm long and will lift a vent weighing up to 6kg and it can be set to start opening at any temperature Replacement Cylinder for Bayliss XL Greenhouse Window Opener, Autovent, No instructions, but it it obvious form the diagram on Amazon how it fits.