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Opening force of 55 Lbs with cylinder, closing force 33 lbs with heavy duty spring.Opening temperature adjustable between 63 -78°FAutomates ventilation and temperature in your home or greenhouse.Replacement cylinders available from Agriculture Solutions LLCHigh quality product of Scandanavia, not cheaply made chinese. 1 Year Warranty
Ingenious temperature-sensitive device automatically opens and closes louver windows to maintain a constant interior climate in your home or greenhouse. Requires no batteries or electricity, it starts opening between 63 -78°F, depending on how you have adjusted the vent.
Liberty Automatic Louver Window Opener Lifts 55 Lbs BDMLJURUO