Extra Thick 27x44mm Framing Pressure Treated as Standard Modular Design with Movable Door position Opening Roof Vents as Standard With a stylish apex roof allowing for optimal light exposure and effective ventilation, the Switch Greenhouse is the perfect environment for your ...Extra Thick 27x44mm Framing Pressure Treated as Standard Modular Design with Movable Door position Opening Roof Vents as Standard With a stylish apex roof allowing for optimal light exposure and effective ventilation, the Switch Greenhouse is the perfect environment for your plants to grow. The Switch uses channelled polycarbonate roof glazing, which provides fantastic insulation, structural strength, and water drainage for use all year round, and comes pressure treated as standard.