The Gard man Auto Vent is perfect for creating and maintaining the perfect greenhouse environment for all your growing needs. It automatically opens and closes as the temperature changes, can easily be adjusted to operate at your required conditions, and is both rust and rot-proof. It is powered by solar energy, so no extra wiring or power source is needed. It comes complete with all the fittings and easy-to-follow instructions you need to install it onto most polycarbonate and aluminium greenhouses.