Broan PM390 Power Pack Range Hood Insert, Silver 6-Inch round duct connector/back draft damper. Designed to fit flush with the bottom of a cabinet or custom hood installation. Also designed to be used with Broan's "Box" or "T" design custom liners. Max Sones/100 CFM 1.5. Rated Voltage 	: 120 V HVI rated 500 CFM, operates at 9.0 sones Improves ventilation and lighting over your stove 390 CFM and 6 sones. The choice of 6 inch round duct (includes damper and adapter) or non-ducted discharge allow you to make the right installation decision for your home One-piece washable aluminum mesh filter HeatSentry automatically turns blower to high speed when excess cooking heat is detected Recommended for use with LB30, LB36, LT30, and LT36 liners (purchase separately) Depth 11-1/4", Height 9-5/8" and Width 20-1/2" (inches) 1 Year Limited Warranty