Question about Broan-NuTone Designer 721 Ceiling Fan
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Posted on Jan 02, 2017
Mine was doing the same thing. I found it was coated with dust.
I took the blower out [unplugged it, and removed the single screw holding it to the box], took the face plate off [removed 4 or five screws] brushed the squirrel-cage fan blades using a narrow, long and stiff bristled brush, and reassembled it [used care to align the small plastic axle on the flap valve ] and reinstalled it. The vibration was greatly lessened and the fan was about as quiet as it had ever been.
Posted on Feb 02, 2009
I ran into the same problem, Lowe's carries Broan exhaust vents. They had both a replacement motor for all generations of 678 fans for $18, and they also had the latest generation of the complete unit for $40. I bought the complete unit, which included the fan I needed. Just unbolted it from the new bracket and bolted it to the old one. The new light housing, trim piece, and lens also interchanged. The existing one was old and yellowed, so this made for a huge improvement. All done from in the living space as well.
Posted on Aug 01, 2010
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