Bayliss XL Greenhouse Window Opener fleece and fleece bags Maximum opening distance: up to

Maximum opening distance: up to 45 cm

these items cannot be delivered to the Isle of Wight

How the Thermostat-Controlled Self-Ignition System Works

following the installation instructions

Bayliss XL Greenhouse Window Opener fleece and fleece bags Maximum opening distance: up toThis Bayliss XL is an extremely reliable automatic vent opener. The opener is activated by a stainless steel cylinder containing a mineral wax which expands with heat; this pushes a piston causing the vent to open. As the temperature falls the wax contracts and a strong stainless steel spring closes the opener. For roof vents weighing up to 12lbs, approx. 30" x 24" (76cm x 61cm). Can be clamped onto aluminium greenhouses no need for any drilling. If a