You are viewing Panasonic's Whisper Ceiling™ ventilation fan.  Panasonic VQ3 Whisper Ceiling ventilation fans are very quiet and exceptionally energy efficient. They are ideal for bathroom ventilation. A testament to their quality is that these fans are rated for continuous operation. Panasonic fans include a built-in backdraft damper, thermal fuse protection, and rust-proof paint on a galvanized steel body. You will need a PDF reader to view the below spec sheets: FV 05VQ3 Spec Sheet, 50 CFM, 0.3 Sones, 13 watts, 4" duct FV 08VQ3 Spec Sheet, 80 CFM, 0.4 Sones, 23 watts, 4" duct FV 11VQ3 Spec Sheet, 110 CFM, 0.8 sones, 31 watts, 4" duct FV 15VQ4 Spec Sheet, 150 CFM, 1.5 Sones, 40 watts, 6" duct FV 20VQ3 Spec Sheet, 190 CFM, 1.3 Sones, 42 watts, 6" duct FV 30VQ3 Spec Sheet, 290 CFM, 2.0 Sones, 64 watts, 6" duct FV 40VQ3 Spec Sheet, 380 CFM, 3.0 Sones, 112 watts. 6" duct Our company specializes in ventilation fans, equipment and accessories. We carry what we believe is the best quality exhaust fans.  We also have UL Listed flex duct, time delay switches, timers, humdistats, and even UL-181BFX listed duct tape.  Using these top quality components will ensure many many satisfying years of trouble free operation with your Panasonic exhaust fan. Our Panasonic Fan Customer Service Guarantee.  R.E. Williams Has A Full Staff Of Ventilation experts available to assist with sizing and questions you may have.  Our office is open from 7:00 AM - 5:00 PM PST.  Rest assured, when you buy your Panasonic ventilation fan from R.E. Williams we support our customers, throughout the entire warranty period of the fan.  We are an authorized Panasonic distributor, selling online since 2001.  These Panasonic fans usually ship the same business day ordered.