When using CT CYCLONE on a CT 22/33, there should be no harm. HOWEVER, these vacuums were not tested for any longterm effect. These vacuums have a different design than those of today and were out of production for some time now. They were equipped to use filter bags and a dual filter system. They also have good CFM, so it should not present a problem. But again, use at your own risk.
(Tyler / Rick)