Bayliss MK 7 Vent Opener Garden garden trays The zipped access panel allows

The zipped access panel allows easy access for watering

The roof vents can be opened manually or purchase the greenhouse with one automatic opener which will open one of the roof vents based on the temperature

With a planting depth of 1ft 3½in

Easy Emptying - due to the clever

Bayliss MK 7 Vent Opener Garden garden trays The zipped access panel allowsSuitable for use on nearly all greenhouses this Bayliss MK7 is an extremely reliable, British made, automatic vent opener. The bayliss Mk7 vent opener is operated 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. Bayliss guarantee their openers for 2 years but if anything should