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.

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.

Disclosed are polyurethane-based foams. The foams may have one or more vicrucidal/bactericidal agents. The foams may be used as filters that capture and/or inactivate viral particles, such as, virions associated with COVID-19. Also described are methods of making the foams and methods of using the foams.

Disclosed are polyurethane-based foams. The foams may have one or more vicrucidal/bactericidal agents. The foams may be used as filters that capture and/or inactivate viral particles, such as, virions associated with COVID-19. Also described are methods of making the foams and methods of using the foams.

The present invention provides a method to prepare polymer materials with interlocked porous structures by freezing and demulsification, which includes: (1) Preparing an emulsion containing uncrosslinked polymers and crosslinking agents. The uncrosslinked polymers are presented in the organic phase, and the crosslinking agents are presented in the organic phase or water phase. Under freezing, the demulsification is occurred which leads to the interaction between polymers and crosslinking agents, and the crosslinked materials are obtained. (2) After removing the ice crystals, polymer materials with interlocked porous structures are synthesized. The method provided by the present invention is simple to operate, and can well adjust the porous structures of obtained porous polymer materials. In addition, it is suitable for large scale manufacturing. At the same time, this process can form different functional porous polymer materials by simply changing the used monomers. Particularly, it can prepare melt-blown fabrics with antibacterial property, high-throughput vertical porous structures and high-temperature sterilizable feature, therefore, it can be used to manufacture medical products such as masks.

A respiratory protection mask includes detachably connected main body and front cover. The main body includes a shielding member for shielding a wearer's mouth and nose, and has air outlet with air-outlet valve and air inlets with air-inlet valves. The mask is characterized in a guide structure and a limiting structure provided between the main body and the front cover. The guide structure includes corresponding slide rail and slide channel capable of guiding the front cover to move along a linear path parallel to a longitudinal section of the air outlet to assemble to the main body and cover the air-outlet valve. The limiting structure includes corresponding male and female fasteners that are detachably engaged with each other when the front cover is assembled to the main body, preventing the front cover from moving in an opposite direction on the linear path to separate from the main body.

Systems, apparatus and methods for disinfection of airflow. An apparatus for disinfecting air-conditioned airflow in a confined space includes: a modular housing; and a disinfection chamber enclosed within the housing. The disinfection chamber includes a plurality of disinfection sheets. Each disinfection sheet comprises a plurality of ultraviolet (UV) light sources. The airflow is configured to be routed along a serpentine pathway within the housing to expose microorganisms in the airflow to far UV-C light emitted by the UV light sources for an extended and optimal duration.

Systems, apparatus and methods for disinfection of airflow. An apparatus for disinfecting air-conditioned airflow in a confined space includes: a modular housing; and a disinfection chamber enclosed within the housing. The disinfection chamber includes a plurality of disinfection sheets. Each disinfection sheet comprises a plurality of ultraviolet (UV) light sources. The airflow is configured to be routed along a serpentine pathway within the housing to expose microorganisms in the airflow to far UV-C light emitted by the UV light sources for an extended and optimal duration.

An inlet-outlet microbe safety (IOMS) system includes a face mask configured for being secured over at least a nose and a mouth of an individual that is further configured to receive input gas and to output waste gas exhaled by the individual. A breathing device assembly includes a first microbe killer device in a path of the input gas and a second microbe killer device in a path of the waste gas. The face mask is coupled by tubing to the breathing device assembly.

Disclosed herein are methods and systems for face mask with replaceable filter cartridges and components. A face mask includes a mask component, a replaceable filter component, and a closure component. The replaceable filter component is bonded to and as between the closure component and the mask component when the closure component is attached to the mask component.