Abstract: The present disclosure provides a filter cartridge for a facepiece respirator mask body. The filter cartridge includes a cover, a base, and a filter medium. The cover has a top surface, a cover sidewall, cover support elements, and an inhalation vent. The cover support elements extend downwardly from the top surface. The inhalation vent is located at least primarily in the cover sidewall. The base has a bottom surface, a base sidewall, base support elements, and an inhalation port. The base support elements extend upwardly from the bottom surface. The inhalation port is located in the bottom surface. The base and the cover collectively define an interior compartment. The filter medium is sandwiched between the base support elements and the cover support elements in a manner that divides the interior compartment into an upper chamber and a lower chamber.