Airzone makes a ultra quiet 0.8 sones, 110 CFM, DC motor Bathroom Ventilation Fan for 4 and 6 inch Duct. This Ventilation Fan is detachable with 4' and 6' polymer duct adapter with "Noiseless" back draft damper. It can also be mounted in sloped ceilings up to 12-12 pitch (45 degrees). Having a integral two speed fan control is easy to adjust both upper and lower fan speeds. Having 4 isolation dampeners, it provides ultra quiet operation with minimal vibration transfer.
http://www.electricsuppliesonline.com/air-zone-ventilation-fan.html
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