This is a pack of two Bayliss Mk.7 autovents. These autovents automatically opens and closes hinged vents. The autovent uses energy from the sun and surrounding air, the hotter the temperature the wider the vent will open. The Bayliss MK7 Autovent is supplied in a satin anodised finish, with all the fixings and instructions. Designed for timber or aluminium framed vents measuring up to 60cm x 60cm (2ft x 2ft), has a lift load of up to 6kg and opens to a maximum of 30cm (8″). Can be set to start opening from 12°C (55F) The autovents strong metal tube contains a mineral wax which expands with heat. This pushes a piston which opens the vent via a balanced linkage. As the temperature drops, the wax shrinks and a strong stainless steel spring closes the vent and resets the piston. All Bayliss products are guaranteed for two years against faulty manufacture. They are designed and tested to last for many years and are fully serviceable.
Suitable for opening greenhouse roof windows 76cm x 76cm weighing up to 6lbs
Designed to open the window automatically when temperatures increase
Works by wax within the cylinder of the opener expanding when it’s hot, pushing a piston to open the window.
When it’s cool the wax contracts and stainless steel springs close the window.
Suitable for aluminium or wooden greenhouses