| abstract |
A filter element comprises a top frame member, a bottom frame member and a pleated filter assembly received in respective channel sectioned formers comprised by said top and bottom frame members. The formers are integrally bonded with a polyurethane resin core formed in the formers. A mould may include a core member or projections which maintain air passages during moulding, and serve to locate the pleats of the filter element in relation to the air passages. |