Bayliss Automatic Vent Openers

Automatic greenhouse roof vent openers from Bayliss Autovents are widely thought to be the best in the world, suitable for both wooden and aluminum greenhouses. Adequate ventilation is an important aspect of greenhouse growing and this solar powered automatic greenhouse vent opener ensures accurate, continuous venting all day and night. Each Automatic Vent Opener opens and closes a hinged roof vent automatically using energy from the warmth of the sun or the surrounding air. The warmer the temperature gets inside the greenhouse gets, the wider the Automatic Vent Opener opens the vent. Because it uses no electricity or batteries, it is a very environmentally friendly product. The vent begins to open at about 70 degrees, both the single and triple spring have a lifting force of 14 pounds, the triple spring being a better option for holding open vents in windy areas. Single Spring kit - Best for roof vents where gravity helps to close the vent Triple Spring Kit- Best for wall vents Replacement tube- Replacement tubes are compatible with both single and triple spring units. These openers have our special Bayliss Autovent Power Tube with an adjustable beginning opening temperature of 65–75°F. Fully open at 20° higher. Manufacturer’s 2-year guarantee Wide opening of up to 12 inches Greenhouse vent opener with wind strap