Ventomax Automatic Roof Vent Opener Toughened Glass Temperature control in a greenhouse

Temperature control in a greenhouse is vitally important to good growing

A single Phoenix will heat a greenhouse up to 100 sq

Control of the temperature is achieved with the 2nd dial

strong 10ins x 6ft shelf can hold a seed tray placed lengthways

Capable of heating greenhouses up to 8x14 in size and keeping a greenhouse up to 12x20 frost free

Ventomax Automatic Roof Vent Opener Toughened Glass Temperature control in a greenhouseThis reliable and effective automatic opener will open and close your greenhouse roof vent far better than you could ever achieve manually. This model is not designed to be removed during the winter months although it is still possible with a little work.