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20" D x 20" H
and the tongue and groove cladding is made of the same treated Western Red Cedar as the greenhouse
Paraffin oil in piston expands starting around 72°F
making it both functional and a visual centerpiece
Roof canopy protects against sunlight
Alton Thermofor Classic Roof Auto Opener Large Greenhouses 20" D x 20" HAlton Thermofor Classic Roof Auto Opener The Thermofor Classic Roof Auto Opener automatically opens and closes your Alton greenhouse roof vent based on temperature changes, helping improve airflow and prevent overheating. Featuring a heat sensitive oil filled piston, adjustable operating temperatures from 59F to 77F, and no need for electricity or batteries, this easy to install opener provides reliable, low maintenance greenhouse ventilation.
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