Abstract: An air/oil separator or other filtering assembly includes a filter media pack having first and second ends. A flange member is located at the first end of the media pack. The flange member includes a flange for mounting the filtering assembly. A retainer member is located at the second end of the media pack. A layer of perforated material is attached to the flange member. The perforated material is located adjacent to the first end of the media pack. Hardenable material permeates the first end of the media pack and permeates the perforated material to mechanically interlock the flange member to the media pack. A similar mechanical interlock is provided between the media pack and the retainer member. These mechanical interlocks eliminate the interior straps which had previously been used to secure the flange member to the retainer member.

Abstract: A filter testing device is disclosed wherein the ends of a filter element is clamped between resilient seals in a filter holder member. A dioctyl phthalate smoke generator generates smoke which is passed through the filter element. An annular sampler which is mounted between the top member and base member of the filter holder member is moved vertically along the axial length of the filter. The annular sampler has an annular cavity therein with a plurality of radial holes extending from the inner diameter to the annular cavity. A vacuum pump draws the sample from the annular cavity in the annular sampler into a forward light scattering particulate detector device wherein the quantity of smoke is measured on a meter.