Product Information
- Extremely reliable automatic vent opener designed to lift very heavy double-glazed windows weighing up to 35lbs
- Bolts on to aluminium greenhouses (fixings supplied) - for wooden greenhouses it is attached by wood screws (not supplied)
- An aluminium unit approx. 39cm long in an anodised finish
- Operated by an aluminium finned 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
