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Greenhouse Vent opener
Thermal Vent Opener - Hobby
Price: $32.50 plus tax(es)

The oil filled cylinder gradually opens the vent as the temperature rises.
Non-powered and automatic.
15 lbs thrust, maximum opening 18"
solar vent opener, thermal vent opener
Thermal Vent Opener - Shutters (or louvers)
Price: $55.00 plus tax(es)

The oil filled cylinder gradually opens the shutter as the temperature rises.
Non-powered and automatic.
Linkage included.
Maximum thrust - 15 lbs