Best 6 Inch Univeral Make-Up Air Damper

6 Inch Universal Make-Up Air Damper NOTE: Fresh air wall caps are required for use with Make-Up Air Dampers Designed to provide the best technology to provide effective ventilation for a cleaner, healthier home. It eliminate gases, smoke or particulates generated from naturally vented combustion devices like a fireplace or water heater. Interlocked make-up air systems avoid wasted energy associated with barometric solutions and do not let unwanted air into the home during heating or cooling activities so air pressure is equalized for a well-balanced environment. Interlocked make-up air damper systems meet IRC Code requirements for make-up air with range hoods over 400 CFM. Universal design works with any BEST® range hood to balance indoor air pressure by providing interlocked make-up air without requiring a direct wire connection between the range hood and the damper. Instead a sensor is attached to the exhaust duct to detect if the range hood is operating.