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Improve the efficiency of your Snap & Grow greenhouse by equipping it with the Snap & Grow by Palram 2-3/4 in. x 15-3/4 in. Polycarbonate Greenhouse Automatic Vent Arm. The vent arm opens the vent during warm temperature periods and closes it when temperatures cool to improve greenhouse air flow and regulate internal greenhouse temperature. Smart-Lock connectors let you install the vent arm quickly and easily.