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• Works great ,Easy to install and durable for RV,Camper and Home.
• Our High impact/weather proof materials will provide years of service.
• Damper automatically opens when range hood fan is on and closes when off.
• 5.3" x 11.5" Exterior Flange ; 3.5" x 10.3" Rough Opening ; Collar length: 1.8" ;
• The exhaust vent cover damper is lockable.