Aspects of various embodiments herein may be implemented as follows. An apparatus has a material shell, which may be conformed to a user's face, and a securing portion connected to the shell that may operate to secure a filter, such as to the user's face with the filter covering the user's nose and mouth. An adjustable valve is coupled to the filter and operable for providing adjustable air flow through the valve (e.g., selectively bypassing air flow through material of the filter). A securing force can be applied to the material shell, thereby sealing the shell around the user's nose and mouth. Various implementations involve multiple couplers at an attachment region between the material shell and securing portion, which facilitate the application of forces with two or more degrees of freedom for securing to the user's face. Further, various implementations facilitate replacing filters utilized with the mask shell.

Embodiments of the invention include a unidirectional exhalation valve for a respiratory device such as a facemask. The valve opens to vent air out of the interior of the facemask and closes to prevent the inflow of ambient air. The valve is comprised of a valve body, a valve cover and a membrane. The membrane is secured to the valve body around its perimeter by the valve cover. The membrane is comprised of two or more flaps that flex toward a central region, in a direction away from the valve body, to open the unidirectional valve.

Embodiments of the invention include a unidirectional exhalation valve for a respiratory device such as a facemask. The valve opens to vent air out of the interior of the facemask and closes to prevent the inflow of ambient air. The valve is comprised of a valve body, a valve cover and a membrane. The membrane is secured to the valve body around its perimeter by the valve cover. The membrane is comprised of two or more flaps that flex toward a central region, in a direction away from the valve body, to open the unidirectional valve.

A personal protective equipment system including a face mask and an ultraviolet germicidal irradiation stage to irradiate incoming volume of air before being introduced to the user. There is included a flexible printed circuit enclosed within a housing of the face mask, the flexible printed circuit having an array of UV LED circuits. A fan is provided to drive the volume of air through a passage within the mask.

A multilayered hemp face mask for filtering air particulate matter which has velcro loop and hook fabrics integrated with each of the fabric layers of the mask, the mask comprising: at least one DC fan, at least one copper rivet and a magnet, at least two fabric one way valves and a pair of ear muffins.

A multilayered hemp face mask for filtering air particulate matter which has velcro loop and hook fabrics integrated with each of the fabric layers of the mask, the mask comprising: at least one DC fan, at least one copper rivet and a magnet, at least two fabric one way valves and a pair of ear muffins.

A respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component that are in sealing engagement with the elastomeric seal when the valve assembly is in a closed configuration.

A respiratory protection device that includes a valve assembly operable between an open configuration and a closed configuration. In some exemplary embodiments, the respiratory protection device includes an elastomeric seal, and a valve assembly and a breathing air source component that are in sealing engagement with the elastomeric seal when the valve assembly is in a closed configuration.

An inner shell according to an embodiment of the present disclosure, which is provided to maintain a shape of a mask, includes a circumferential part forming an edge, a curved part formed in an arch shape at an inner side of the circumferential part, and a plurality of ribs formed to radially protrude from a peak area of the curved part toward the circumferential part, wherein the circumferential part, the curved part, and the ribs are integrally formed as a sheet member formed of a porous material.

An inner shell according to an embodiment of the present disclosure, which is provided to maintain a shape of a mask, includes a circumferential part forming an edge, a curved part formed in an arch shape at an inner side of the circumferential part, and a plurality of ribs formed to radially protrude from a peak area of the curved part toward the circumferential part, wherein the circumferential part, the curved part, and the ribs are integrally formed as a sheet member formed of a porous material.