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Squirrel-Cage Fan and Dust Filter

I

WAS CONCERNED ABOUT DUSTin my shop and had this filter setup
made at a sheet-metal shop. For about $140, I got the four-speed
squirrel-cage blower in a custom box with a furnace filter on each
side. It hangs on the ceiling where it filters the air by removing air-
borne dust before it settles. It then recirculates the filtered air with a
whirlpool effect.
—JOHNR. THIESEN,South Wales, N.Y.

CHAPTER ONE

Squirrel-cage blower

Hang box

from ceiling.

Furnace filter