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wrote:
wrote:

... Can anyone recommend a model with perhaps three speeds
and of build that will last more than a few years?

I like Lasko's $52 2155A... 3 speeds, electrically-reversible, built-in
thermostat, and sliding panels to fit windows, which can be closed and
locked without removing the fan. It moves 2470 cfm with 90 watts. My $12
(Holmes) window box fan moves 800 cfm with 100 watts.

Ace Hardware sells it for $45 but then there's tax and shipping.

I wouldn't even know how to go about measuring how much air a
box fan moves when mounted in a window. When I tried it, it
seemed that covering all but the area of the fan blades seemed
to work better.

Anthony