Patent ID: 7175028

Claim:
A screen assembly comprising a frame, first and second spaced side members on said frame, ends on said side members, upper and lower surfaces on said side members, first and second spaced end members on said frame at said ends of said side members, a plurality of spaced ribs extending between and joining said spaced side members, openings between said side members and said end members, a screen on said frame overlying said openings, and recessed indentations in said lower surfaces of said spaced side members wherein said screen includes undulations having ridges and valleys which extend longitudinally of said first and second side members wherein said openings are oriented in rows extending crosswise of said side members wherein a plurality of rows of openings are located between at least certain of said ribs wherein said end members include upper end member surfaces and lower end member services, and a lip on said lower end member surface of said first end member wherein said lip is part of a depression in said lower end member surface.