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Controlling temperatures in a cold frame or greenhouse is straightforward with this automatic control. It incorporates a gas-charged cylinder of adjustable volume. As the temperature rises, the gas expands; it will open a 15 lb window, more than adequate in cold frames and greenhouses. A simple adjustment lets you control the operating range. As temperatures fluctuate, the 12 1/2" long unit will open and close a window as necessary to prevent disasters. Made in England. Non-rusting anodized alum Greenhouse Window, Diy Greenhouse Plans, Heating A Greenhouse, Backyard Greenhouse, Greenhouse Ventilation, Greenhouse Shelves, Backyard Aquaponics, Greenhouse Interiors, Greenhouse Growing
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leevalley.com
$49.50
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Heat-Activated Window Opener

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Controlling temperatures in a cold frame or greenhouse is straightforward with this automatic control.
It incorporates a gas-charged cylinder of adjustable volume. As the temperature rises, the gas expands; it will open a 15 lb window, more than adequate in cold frames and greenhouses. A simple adjustment lets you control the operating range. As temperatures fluctuate, the 12 1/2" long unit will open and close a window as necessary to prevent disasters.
Made in England.
Non-rusting anodized aluminum and powder-coated steel.
Ships from and sold by
www.leevalley.com
leevalleytools
Lee Valley Tools
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