Air King has had a 20", model 9166 for quite awhile. I bought my original in 1998. It filled the important niche between an industrial strength attic fan and a smaller lightweight window fan. In 2004 the original plastic fan blade failed, but fortunately I was able to obtain a replacement. That model 9166 continued in service until last month when it screeched to a stop with a seized "lubricated for life" bearing and another cracked plastic blade.The new model 9166D (under review) was purchased as a direct replacement. While the new 9166 now has an aluminum blade, unfortunately it has a weaker smaller motor, resulting in inferior performance. The old 9166 had a quiet low speed of 520 RPM that moved a respectable 4160 CFM. The new 9166's low speed is a noisy 1100 RPM, but at that speed it only moves 2510 CFM. So at that twice the speed it moves only a little more than half the air.
Air King's 9166D specifications tell the story of the weaker performance. The weaker motor consumes less power, but is noisier at all speeds.
HIGH MED LOW
OLD CFM 7005 6155 4160
NEW CFM 3560 3120 2510
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