This device opens and closes your greenhouse vent panels for reliable climate control even when you???re away! No electrical power is required. Fluid-filled cylinders expand in warm temperatures. You can raise or lower the temperature setting with a simple twist of the cylinder. Steel with paraffin in the vent opener cylinder Rated to lift up to 15 lbs. Depending upon installation, this vent opener will open a vent 12-18" The opening temperature can be adjusted from approx. 65° to 80° F 12" L; weighs 1/2 lb.
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$69.95
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