Zephyr AK2100BS 30" Power Typhoon Series Under Cabinet Hood with 850 CFM in Stainless Steel Self Cleaning Exclusive filter-less self cleaning system with dishwasher safe residue cups With the Turbine Blade Design, the Power: Typhoon series delivers up to 850 CFM while staying Ultra-Quiet, noise leveling ranging from 0.9 - 5 Sones an exclusive feature built into specific Zephyr hoods which can limit the maximum blower CFM to 590, 390 or 290 to meet local code requirements