This clever accessory from Palram-Canopia works by automatically opening your greenhouse vent at warm temperatures and closing it when it is cooler. Easy to attach, this Automated Vent Arm allows peace of mind over your plants enjoying the right temperatures to flourish. Engineered Specifically to Replace a Manual Vent Arm Programmable to open and close at desired temperatures. Easy to Attach to your Greenhouse Vent Mechanical so no electricity needed
