Abstract: A filter of the type used to filter gases or liquids has molded plastic end caps on each end of the filter element with the ends of the filter element molded into the end caps. To prevent the end of the filter element from being exposed through the exterior surface of one of the end caps, a spacer is located between the end of the filter element and the exterior surface of the end cap. The spacer allows the plastic material of the end cap to permeate the spacer to form a thin layer of plastic on the end of the filter element. This prevents thin spots in the end cap which could result in leakage through the end cap.

Abstract: A disposable two-stage air cleaner includes a housing forming an air inlet, a separation chamber, a dirt collection chamber, and an air outlet. A filter element is located between the separation chamber and the air outlet. The air inlet moves the air in a circular pattern in the separation chamber, whereby dirt is thrown outwardly by centrifugal force. An air scavenging system is employed in which air laden with dirt from the first-stage separation chamber is scooped into the dirt collection chamber and air from the dirt collection chamber is allowed to recirculate into the separation chamber after the air flow has been slowed so that the dirt falls from the air stream. The air cleaner thus provides performance which is equal to or better than reusable air cleaners of the prior art.