A heat-moisture exchanger device for use with a patient ventilator circuit is provided. A rotatable central element is positioned in a housing, and a filter is coupled to the rotatable central element. A first conduit can allow fluid to enter or exit a chamber of the housing and a second conduit on an opposed surface can allow fluid to enter or exit the chamber. A third conduit on the rotatable central element can selectively place the first conduit in sealed fluid communication with the second conduit when the rotatable central element is in a first position. Alternatively, the rotatable central element can be rotated to a second position in which the third conduit does not place the first conduit in sealed fluid communication with the second conduit, and any fluid flowing through the chamber must pass through the filter.