by Poly-Tex Inc.
(1)Buy new:
5 used & new from $54.97
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Poly-Tex Auto Vent Opener fits the Nature Line of greenhouses to keep your greenhouse at the optimum temperature. The vent arm contains a special oil that expands as the temperature increases. As temperature reaches the upper 60s, the roof vent is lifted to allow the interior to cool off. When the temperature goes back down, the oil contracts and the vent is closed. Accessory Type: Ventilation kit, Style: Nature, Length (in.): 16, Width (in.): 3, Glazing: Expanding and contracting oil, Ventilation: Auto ventilation kit
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