This article is from the Woodworking FAQ Collection 2, by multiple authors.
From: firstname.lastname@example.org (Clif Flynt)
Date: 17 Apr 90 06:37:50 GMT
>I have a couple of fans from old furnaces, and I'd like to turn them into
This is the idea I played with recently, and seems to work well.
Sears sells an couple electrostatic air filters to replace the old
drop-in filter in your furnace. The smaller one is the same thickness as
a standard furnace filter, and comes in similar height/width.
I bought a 20 x 20 x 3/4 " electrostatic (~150), and a
20 x 20 " Purity Air Filter (a heavier duty version of the standard furnace
filter), and scavenged an old 20 inch window fan for motor and fan blades.
An afternoon in the shop created a box to mount the fan motor and blade,
with dado's cut for the electrostatic precipitator and the Purity filter.
And, in the tradition of bad ascii drawings -
/- Fan Motor and Blades v ----------- | | | | | | | | | | | b | | | | b | | | | b | | | | b | | | | M | --> Air Flow | | | M | | | | b | | | | b | | | | b | | | | b | | | | | | | | | ----------- ^ ^ | | - Precipitator | Furnace Filter