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Hi Anita - CFM Ratings: 150 (Working Speed); 340 (High Speed); 350 (Boost). Sones Ratings: 1.0 (Working Speed); 5.1 (High Speed); 6.6 (Boost Speed). Working speed is the lowest speed at which you get at least 100 CFMs Working speed is a testing level required by HVI (Home Venting Institute) and it should allow you to compare product performance differences a little easier. Quiet range hoods are generally 1-3 sones. We use a third party (HVI) to certify hoods for CFMs and Sones. HVI Certification programs were created to provide a fair and credible method of comparing ventilation performance of similar products. For more about HVI, visit: https://www.hvi.org/ - Thanks for your interest in GE® 30" Wall-Mount Pyramid Chimney Hood JVW5301FJDS. Explore Black Slate Appliances at: https://www.geappliances.com/ge/black-slate-appliances.htm - Keep in touch at GEAppliances.com. Sue
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