Copy过来的spec, 说最大档就是900cfm,但是不是真有那么大吸力就不知道了 AP238-PS31-36 Features Mounting version: Wall Mount Available Dimensions: 36” x 21” x 42.5" (W x D x H) Voltage: 120v @ 60 Hz / ETL Certified (US & Canada electrical safety) Telescopic Chimney fits 9 ft ceiling Speeds: 4 levels Airflow: 280CFM / 460CFM / 670CFM / 900CFM Noise Level: Low Speed: 43dB to Max Speed: 68dB Motor: Ultra Quiet Single Chamber Motor Keypad: Touch Sensitive with Blue LED Lighting Lighting: 2x35W Halogen lights Venting Size: 6" Round Duct Vent Filters: Dishwasher Safe Stainless Steel Baffle Filters Material: 19 Gauge High Quality Brushed Stainless Steel Features: Wireless Credit Card Sized Remote Control and Heat Sensitive Auto Speed Function Controls Fan Speed Automatically Warranty: 1 year parts