Abstract: An interchangeable filter system for a respirator, said system comprising a support frame, an air intake opening therein, a plurality of interchangeable filter holders each configured for selective mounting thereof to the support frame, and each configured to receive and hold a different respective type of air filtration device in a working position of operable relationship to said air intake opening to filter incoming ambient air, whereby the plurality of interchangeable filter holders enable customization of the system according to available on-hand inventory of one of more different types of air filtration devices. The system enables use of filter pads, cartridge filters and different styles of disposable air filtration facemasks as interchangeable air filtration devices on PAPR fan units, orinasal respirators and full-face respirators.

Abstract: An extension device for a face shield features a shell of at least partially dome-like form that delimits a hollow interior space for accommodating a cranial region of a user's head. At a lower marginal area of a frontal region of the shell that is worn over the user's forehead, and at an internal surface of the shell, one or more coupling elements are arranged for selective coupling to an outer side of the face shield to secure said shell onto the face shield in a manner fully supported thereby. An internal airflow channel in a scalp-covering part of the shell communicates with a chimney-like airflow space between two forehead depressions at the frontal region to exhaust warm air from the facial region. The scalp-covering part is angled at more than 90-degrees to the lower marginal area of the frontal region, so as to reside at a rearwardly inclined slope relative to the user's head when worn for greater ventilating effect.

Abstract: A protective shield features a single-piece transparent dome or shell having a rear opening through which facial and cranial regions of a user's head are received, thereby providing improved coverage over conventional face shields that cover the face only. Inward protrusions at a transitional region between the facial and cranial portions of the shield rest against the forehead to offset the facial portion of the shield forwardly of the user's face to allow airflow, optionally introduced from an external fan via an airflow channel integrally formed in the cranial portion. A flexible connector clip has a J-shaped profile for engaging an out-turned flange around the boundary of the shield s rear opening, to enable clipped connection of a bib or shroud. Support protrusions in an underside of the cranial portion maintain airspace above the head, which is further optimized by a rearwardly sloped incline of the cranial portion.