Broan® interlocked make up air dampers provide outside air when required to keep the air in the home fresher by allowing the range hood to operate at optimum levels|Universal design works with any Broan® 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|Slave dampers (MD6S, MD8S or MD10S) are interlocked to the main automatic or universal make up air damper and open in unison for synchronized operation|Slave dampers can be ganged together to provide a cost effective means to provide for higher volumes of make up air|Interlocked make up air damper systems meet IRC code requirements for make up air with range hoods over 400 cfm|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|Fresh air wall caps are required for use with make up air dampers

IRC Code M1503.4