wrote:

... the best window fan I know of that is still being produced is
the Air King 9166D. It's not cheap, though: $249.99 at Amazon.com.

.... $183 as Grainger item 3C614. Is there a cheaper Lasko (800 394 3267)
version? It moves 3560 cfm with 170 W (21 cfm/W) vs 2470/90 = 27 for the
$50 Lasko 2155A.

Nick