Top positive review
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Solid and Quiet - A Good Choice
on September 29, 2012
These are as quiet and as strong-venting as promised.
We had three of these fans installed by a contractor. The team working our project reported the units went in easily from above the room, but likely would be difficult to installed from within the room due to the 6-inch ducting called for on the 150-CFM model. In most homes, 3-inch or 4-inch ducting is found. As a personal observation, the smaller ducting likely is why other Panasonic units that share common parts are louder - the fans are working against more resistance and therefore move less air with slightly more noise.
As another reviewer noted - there is a significant difference in quality and performance between these units and the "best" available at the various big-box stores. The noise factor is more significant than I thought it would be, these units run at 0.3 sones versus 1.0 sones for the big-box "best" units. Additionally, the Panasonic units have no stamped parts with flanges to bend, and, no cheap fans with rotor play and broad clearances - all indicating sloppy design and construction. Even the packaging is superior, and in my opinion that says a lot about the manufacturing.
The units are so quiet we have accidentally left them running overnight. Some of those count-down timer switches may be my next purchase.
I am confident in recommending these high-capacity, very low-noise fans for new construction and major remodels where ceilings are open from below or attic space is open for work from above. I am less confident for homeowners doing like-for-like replacement due to the duct-size issue with the 150-CFM model I noted above. For that application and would recommend looking at the 110-CFM or 80-CFM models that use the more common duct sizes.
The price differential between these units on Amazon.com and the "best" units at the big-box stores is only about $30 apiece. The quality and workmanship on these units greatly exceeds those "best" ones.