My 1970 Dayton (Grainger) shop vac runs some air through the motor - the
main airstream is exhausted just below the elevated case of the motor, and
most of it spreads out radially, but a bit is drawn through the motor itself
for cooling.
Karl
>> Unlike the Ridgid, the vacuum airflow does not go through the motor.
>
> WTF? Even my cheap plastic Sears (not Craftsman) unit doesn't run suction
> air through the motor! Dust even from common materials like flour can be
> very explosive and vacuum cleaner motors emit sparks.
>
> -- Randall
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