A:Answer Hi Maury- The range hood has a four-speed with boost, 310-CFM venting system to effectively removes smoke, grease, odors and moisture. Sones Ratings: 7.0 (Boost Speed), 5.5 (High Speed), 3.0 (Medium Speed), 1.0 (Low Speed). You should certainly be pleased with your choice. EASY INSTALLATION- Play Video: https://www.youtube.com/embed/nrqTMMN9feA?rel=0 - Keep in touch! SUE@GEA