Three roof vents

The insulated polycarbonate glazing helps retain heat better than thin single-layer coverings

Optimal Growing Environment: Protects your plants from heat stress and excessive humidity

professional assembly is strongly recommended for safety and performance

The Duramax Insulated Garden Glass Room or sunroom is versatile and can be used as a garden shed

Alton | Thermofor Roof Vent Opener Piston Replacement Palram - Canopia Carport Three roof ventsThe Thermofor Long Piston Replacement is a direct replacement cylinder designed for Thermofor automatic roof vent openers used in Alton greenhouses. If your current opener is no longer responding properly to temperature changes, replacing the piston is a simple way to restore reliable, automatic ventilation. This heat sensitive cylinder contains a wax core that expands as temperatures rise and contracts as they cool, driving the vent to open and close