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Halls Automatic Vent Opener
Greenhouse Supply
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Greenhouse Accessories
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Our Price:
$59.95
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Roof Vent Opener
Replacement Cylinder
(Will update display)
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Why Shop Planet Natural?
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Halls Greenhouses
.
Free flow of air without too much wind is essential especially during the growing season. Halls® Automatic Vent Opener uses temperature sensitive cylinders that expand and contract to automatically open and close your greenhouse vents. Provides ideal growing conditions, even when no one is home!
Easy to install, the opener simply replaces an existing vent arm. Ideal for hinged vents weighing less than 15 lbs. May be adjusted for different opening temperatures. No batteries or electricity required. One-year warranty.
Tip: NOT recommended for use with Halls® Cold Frames -- they do not have a large enough frame to attach the opener.
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