On Sun, 22 Jan 2017 09:33:33 -0000 (UTC), gregz
wrote:

wrote:
Look at the OP date!!!!!!!!!!!!!!!!!!!

I never tried variable, but I have inserted a green plug. It reduces speed
some. Enough to keep calmer. They can be very loud. Some older belt fans
were pretty quiet.

Greg

The easiest way is to buy a multi speed motor. Mine are 2 speed
(1/4-1/8 hp) They are 24" units 22" blade and on 1/4 hp they move a
lot of air. On 1/8 they are very quiet.
You can also find 3 speed or even 4 speed motors but be sure they are
matched to the blade in high speed. It is like propping a boat. If you
have too little pitch you are losing performance and to high a pitch
will lug the motor and burn it up.