Patent ID: 7635403

Claim:
An air cleaner comprising: (a) a housing having an inlet end, an opposite outlet end, and a sidewall extending between the inlet end and outlet end; (i) said sidewall defining an access opening to provide for entry into an internal volume of the housing; the access opening being between the inlet end and the outlet end; (b) a filter element having a seal member operably installed and sealed in the housing; the filter element having first and second opposite flow faces; the filter element including media having a plurality of flutes; each of the flutes having an upstream portion adjacent to the first flow face and a downstream portion adjacent to the second flow face; selected ones of the flutes being open at the upstream portion and closed at the downstream portion; and selected ones of said flutes being closed at the upstream portion and open at the downstream portion; (i) the filter element being operably installed to provide air to pass through the inlet end of the housing, through the first flow face, through the second flow face, and out through the outlet end of the housing; (ii) said housing being constructed and arranged to accept the filter element through the access opening in the sidewall; (c) an access cover removably positioned over the access opening; the access cover being between the inlet end and the outlet end; and (i) the access cover being unsecured to the filter element when the access cover and the filter element are operably installed in the housing.