Patent ID: 7967898

Claim:
A method of cleaning a media construction; the method comprising: (a) providing a frame having a tube sheet defining an aperture; (b) providing a first filter element mounted on the frame and sealed against the tube sheet in gas-flow communication with the aperture; the first filter element including: (i) at least a first media construction being at least a two-layered construction; the first media construction having opposite first and second ends and a plurality of flutes; (ii) each of the flutes having a first end portion adjacent to the first media construction first end, and a second end portion adjacent to the first media construction second end; (A) selected ones of the flutes being open at the first end portion and closed at the second end portion; and selected ones of the flutes being closed at the first end portion and open at the second end portion to result in an upstream flow face and a downstream flow face; and (iii) each layered construction being oriented at an angle relative to a vertical axis generally orthogonal to the tube sheet; the angle of each layered construction relative to the vertical axis being at least 10° and less than 90°; and (c) cleaning the first media construction by pulsing pressurized fluid into the first media construction through the downstream flow face, and out of the first media construction through the upstream flow face.