An air cleaner assembly : a. a housing including a housing body and a removable cover that together define an interior volume for holding a filter cartridge , the removable cover being rotatable with respect to the housing body along a plane of rotation (R); b. a first lug located on the housing body , the first lug having a first ramped engagement surface ; c. a second lug located on the cover, the second lug having a second ramped engagement surface ; and d. a lock mechanism disposed on the cover, the lock mechanism including a lock member axially movable between a locked position and an unlocked position; e. wherein the cover is positionable between a secured position and an unsecured position: i. wherein the lock member extends alongside a portion of the first lug to provide resistance to the cover from being rotated in a second direction opposite a first direction; ii. in the unsecured position, the lock member is removed from being alongside the first lug such that the cover can be rotated in the second direction; characterized in that in the secured position, the first ramped engagement surface of the first lug being in overlapping contact with the second ramped engagement surface of the second lug to prevent the cover from being rotated in the first direction along the plane of rotation (R), wherein the first and second ramped engagement surfaces are planar surfaces being disposed at an oblique angle relative to the plane of rotation (R) and parallel to each other. a. a housing including a housing body and a removable cover that together define an interior volume for holding a filter cartridge , the removable cover being rotatable with respect to the housing body along a plane of rotation (R); b. a first lug located on the housing body , the first lug having a first ramped engagement surface ; c. a second lug located on the cover, the second lug having a second ramped engagement surface ; and d. a lock mechanism disposed on the cover, the lock mechanism including a lock member axially movable between a locked position and an unlocked position; e. wherein the cover is positionable between a secured position and an unsecured position: i. wherein the lock member extends alongside a portion of the first lug to provide resistance to the cover from being rotated in a second direction opposite a first direction; ii. in the unsecured position, the lock member is removed from being alongside the first lug such that the cover can be rotated in the second direction; characterized in that in the secured position, the first ramped engagement surface of the first lug being in overlapping contact with the second ramped engagement surface of the second lug to prevent the cover from being rotated in the first direction along the plane of rotation (R), wherein the first and second ramped engagement surfaces are planar surfaces being disposed at an oblique angle relative to the plane of rotation (R) and parallel to each other. i. wherein the lock member extends alongside a portion of the first lug to provide resistance to the cover from being rotated in a second direction opposite a first direction; ii. in the unsecured position, the lock member is removed from being alongside the first lug such that the cover can be rotated in the second direction; <EOS>