COMAIR EG&G ROTRON PATRIOT 7" ROUND VENTILATION COOLING FAN 24V 1A DC PD24B3

Actual outside diameter is 6-3/4". Don't quote me, but I believe it has ball bearings.

It spins right up and moves a lot of air.

Most items paid for by 3 PM EST (Noon PST) are shipped out the very same day.