Filter cartridge with seal member and methods

An air filter cartridge comprising:

• (a) a media pack having upstream and downstream opposite flow faces, first and second opposite sides extending between the upstream and downstream opposite flow faces, and third and fourth opposite sides extending between the upstream and downstream opposite flow faces;
• (b) first and second side panels arranged parallel to each other with the media pack therebetween;
• (c) a third side panel against the third side of the media pack;
• (d) a fourth side panel against the fourth side of the media pack;
• (e) a handle secured to at least one of the first, second, third, and fourth side panels;
• and
• (f) a gasket arrangement including:
• (i) a perimeter gasket member around a perimeter of the downstream flow face to form a window, with an opening in the window exposing the downstream flow face;
• and
• (ii) a side gasket member adjacent to the perimeter gasket member without a gap in between, and adjacent to at least a partial extension of the first side panel;
• the side gasket member including no portion against the second side panel, third side panel, and fourth side panel;
• the side gasket member configured to create a seal by compression of the side gasket member with a tubesheet, when the air filter cartridge is installed in a tubesheet.