The Bayliss Mk7 Greenhouse Autovent Is Approximately 29cm Long And Will Lift A Vent Weighing Up To 6kg. It Can Be Set To Start Opening At Any Temperature Between 12 25c, Giving A Maximum Opening Of Approximately 30cm.our Supplier Gives A 2 Year Guarantee On All Replacement Cylinders Although They Should Last 6 10 Yearsimportant To Ensure That Each Cylinder Is Fitted Exactly Parallel To The Window To Avoid Excess Pressure On Sealwill Fit All Greenhouses Except Robinsons Branddrill Holes Are 6cm 7cm Apartreplacement Cyclinders Also Availableavailable In Natural Aluminium Brown Finishes.
