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The Mk 7 Orchid Wax version can be set to start opening the window at between 75°F and 90°F. Brown Bayliss Mk 7 Heavy Duty Autovent - full retail package Opens greenhouse roof vents as the temperature rises, automaticaly closes as temperature drops - Simple, Strong & Easy to Fit. Easy to Fit - Screws included for fitting to most Aluminium or Timber Greenhouses (full fitting instructions supplied Green Powder Coated Finish Easy to Set - One Simple Adjustment Solar Powered - Non Electric Strong Build - Balanced Double Arm Lifting Action Eliminates Vent Twisting Powder Coated Anodised Aluminium Construction - All Parts Corrosion Resistant Spring Controlled - Avoids Wind Damage When Opening and Closing Quality Assurance - All Parts Guaranteed Suitable for opening hinged vents up to about 2ft. 6in. square (75cn. square) of normal construction If you wish to open a vent on the side of the greenhouse, a polycarbonate vent or if your greenhouse is in an exposed, very windy location please look at the Triple Spring and Hydraulicheck variants.
