AUTOMATIC HEAT-ACTIVATED VENTING: The temperature-responsive cylinder opens a compatible greenhouse vent as the air warms and closes it as temperatures fall; no solar panel, batteries, wiring, or electricity required.
DUAL SPRING, UP TO 30 LB: Two springs support balanced lifting and closing for compatible vents weighing up to 30 lb. The vent must move freely and be properly aligned for reliable operation
ADJUSTABLE 59-77°F START RANGE: Set the opener to begin opening between 59 and 77°F (15 and 25°C) to support seasonal ventilation for greenhouses, growing houses, and cold frames
GREENHOUSE WINDOWS AND COLD FRAMES: Designed for compatible greenhouse roof windows, wall vents, hobby greenhouses, and cold-frame lids. It can replace a manual vent arm where the mounting layout allows
CHECK FIT BEFORE INSTALLATION: Confirm vent weight, free movement, mounting space, and frame design. Mounts to compatible polycarbonate, wood, or metal frames; drilling or an adapter may be required
