Kavolet Automatic Window Opener, Double Spring Automatic Window Opener, Greenhouse Automatic Opening and Closing Temperature Function

• The maximum hole diameter is about 30/86 (depending on settings and load). Suitable for vents weighing up to 7 kg/15 lbs.
• The automatic opening temperature range can be adjusted between 15-25°C (60-77°F) by rotating the cylinder. (Clockwise is at the top, counterclockwise is down)
• Compared with the single spring exhaust port, the double spring has stronger thrust, stronger and more durable. The double spring vent opener can be closed manually.
• Stainless steel fittings are durable. The aluminum frame looks more shiny, durable and rust resistant. Easy to install, suitable for all aluminium frame greenhouses.
• The elongated painted aluminium cylinder is weatherproof. The solar thermal trigger can automatically expand and contract when the temperature changes.

Characteristic: Material: Aluminum+SS! Item weight: approx. 376 grams / 13.26 ounces! Package weight: approx. 439 grams / 15.49 ounces! Package size: approx. 38*9.5*4.5cm/14.96*3.74*1.77in Packing list: 1 x vent opener. 1 x accessory pack, 1 x manual (English). Comment: The heating temperature should not exceed 50℃(122℉). Do not disassemble the cylinder. Cool the cylinder for 24 hours before installation. Do not heat above 50℃ (122℉). Do not disassemble the cylinder. Cool the cylinder for 24 hours before installation.