Automatic Roof Vent Opener
Automate your Greenhouse
Ensures your greenhouse has the optimum ventilation automatically.
Ideal for Summer!
European made and includes a 2 year guarantee.
Opens when it's hot & closes when it's cold.
Strong and durable.
Easy to fit with clear instructions.
Doesn't require batteries, A/C or solar power - an internal wax expands and contracts as the temperature changes.