A protective headgear comprising: a protective helmet that defines an interior space, that comprises an inward major surface, and that comprises a forward window with a windowpane; a head suspension that is connected to the helmet; and an air supply module mounted at least partially within the interior space defined by the helmet, wherein the air supply module comprises central, left lateral, and right lateral trunks (53, 54, 55), wherein each trunk comprises an inward major wall (38, 77, 78) from which sidewalls (67, 68, 69) extend outwardly and at least a portion of each trunk does not comprise an outward major wall, wherein selected central, left and right areas (33, 34, 35) of the inward major surface of the helmet and the central, left lateral, and right lateral trunks (53, 54, 55) of the air supply module are configured and arranged so that when the module is mounted within the interior space defined by the helmet, the selected central, left and right areas (33, 34, 35) of the inward major surface of the helmet combine with the central, left lateral and right lateral trunks (53, 54, 55) of the air supply module to respectively form and define a central air supply passage and left and right lateral air supply passages (57, 58) for delivering air to a wearer of the protective headgear, and, wherein the air supply module comprises an external, remote handle that is remotely connected to an air valve that is operative to control a rate at which air is directed into the central air supply passage in comparison to a rate at which air is directed into the left and right lateral air supply passages. a protective helmet that defines an interior space, that comprises an inward major surface, and that comprises a forward window with a windowpane; a head suspension that is connected to the helmet; and an air supply module mounted at least partially within the interior space defined by the helmet, wherein the air supply module comprises central, left lateral, and right lateral trunks (53, 54, 55), wherein each trunk comprises an inward major wall (38, 77, 78) from which sidewalls (67, 68, 69) extend outwardly and at least a portion of each trunk does not comprise an outward major wall, wherein selected central, left and right areas (33, 34, 35) of the inward major surface of the helmet and the central, left lateral, and right lateral trunks (53, 54, 55) of the air supply module are wherein the air supply module comprises central, left lateral, and right lateral trunks (53, 54, 55), wherein each trunk comprises an inward major wall (38, 77, 78) from which sidewalls (67, 68, 69) extend outwardly and at least a portion of each trunk does not comprise an outward major wall, wherein selected central, left and right areas (33, 34, 35) of the inward major surface of the helmet and the central, left lateral, and right lateral trunks (53, 54, 55) of the air supply module are configured and arranged so that when the module is mounted within the interior space defined by the helmet, the selected central, left and right areas (33, 34, 35) of the inward major surface of the helmet combine with the central, left lateral and right lateral trunks (53, 54, 55) of the air supply module to respectively form and define a central air supply passage and left and right lateral air supply passages (57, 58) for delivering air to a wearer of the protective headgear, and, wherein the air supply module comprises an external, remote handle that is remotely connected to an air valve that is operative to control a rate at which air is directed into the central air supply passage in comparison to a rate at which air is directed into the left and right lateral air supply passages.