Abstract: An adjustable buckle located around a resilience strap for a respirator including a resilient strap material having a particular length, width and thickness. An adjustable buckle is molded around the strap at a particular position and formed of two interlocking members each located at an end position of the strap and having at least one portion that interlocks with a corresponding portion of the other member. This provide for locking and unlocking of the members with each other. At least one of the interlocking members includes a plurality of such portions that interlocks with the corresponding portion of the other member. The plurality of portions are spaced from each other along the length of the strap so that an individual one of the plurality of portions may be interlocked with the corresponding portion of the other member to adjust the length of the strap.

Abstract: A full face respirator mask includes a rigid plastic integrally molded lens member that has a transparent viewing portion and a central integrally molded port portion. The central port portion is disposed beneath the viewing portion when the mask is viewed from a front elevation. An integrally molded exhalation port is disposed in the central port portion of the rigid plastic lens. First and second air intake ports are disposed in the integrally molded lens member to either side of the central port portion of the rigid plastic lens member. Each air intake port is adapted to support either a plug member to close off the air intake ports or a filter cartridge to filter air passing through the air intake port.