Boxed Dimensions & Weight: W: 30.0cm H: 6.0cm D: 4.5cm 500g Features: 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) Barcode: 5033490000019