Broan NuTone MD6T 6" Automatic Make-Up Air Damper - Direct Wired Broan MD6T 6 In. Automatic Make-Up Air Damper; Dampers can be ganged for high volume applications; For use with Broan Range Hoods Broan Elite 60000, Broan Elite 64000, QP3, EW56, EW58, EI59; 24 volt, 60 Hz AC motor; 24 gauge galvanized steel construction; 6 in. round duct; Height 6.000; Width 9.000; Depth 10.000; Weight 2.00; Color 0; Operating System; Batteries Included; Batteries Required; Number of Batteries 0; Battery Type no batteries required; Language English, French, Spanish Normally closed damper; Assembly Required Foam seal minimizes air leakage Synchronized to only open during fan or range hood operation Doesnt let unwanted air into the home during heating/cooling