Propagation & Heating Home / Greenhouse Equipment / Propagation & Heating / Bayliss Greenhouse Autovent XL Bayliss Greenhouse Autovent XL Bayliss Greenhouse Autovent XL £25.99 Add to your Wish List Specifications Reliable, quality built anodised aluminium automatic window opener for greenhouses. Clamps onto most aluminium greenhouse vents – no need for drilling. Can also be used for timber framed vents. Will fit a window weighing 12.5kgs (28lbs), exerting a load of 6.5kgs (14lbs). It is temperature adjustable and can be set to start opening the window from 13 – 18°C (55 -65 °F) Product Code: 355521