A breathing mask comprising a mask body, a mask bead, a strap holder and a filter device. Mask bead, strap holder and filter device are connected to the mask body and/or are part of the mask body. The breathing mask encloses the nose and mouth of the user, the mask bead partially delimiting a receiving opening for the nose and mouth. The filter device comprises at least one filter receptacle and at least one filter element. The mask bead has a bearing region configured as a sealing lip and is designed such that the breathing mask bears with the sealing lip on the facial skin around nose and mouth and provides a substantially leak-tight seal to respiratory gas. The filter device is at least in part exchangeable and respiratory gas can at least partially flow through it.

The air purifying apparatus comprises a purifying chamber comprising a peripheral wall that has an air inlet and an air outlet. A UV light source is located within an irradiation portion of the purifying chamber. An air channel extends between the air inlet and the air outlet for allowing the air to flow therein. A main baffle plate is fixed within the purifying chamber downstream of the air inlet and upstream of the air outlet such that the air channel will be formed about the main baffle plate, the main baffle plate comprising a UV-reflective surface in register with the UV light source and that is tangentially oriented at least partly upstream to reflect at least part of the UV light emitted by the UV light source upstream in the air channel. Also, the air channel has a wider cross-sectional area at its irradiation portion than at the air inlet, for decreasing the speed of the air flowing through the air channel which increases the time during which air particles will be exposed to the UV light source.

Systems for biological sensing that include, in one implementation, a sensor, a filter, a pump, and a flow channel. The sensor is configured to test a gas sample. The sensor includes an optical cavity. The filter is configured to filter the gas sample. The flow channel is formed by at least the optical cavity, the filter, and the pump. The pump is configured to generate a negative pressure differential inside the flow channel.

The present invention relates to a filter unit (10) for a compressor, comprising a housing (12) with an inlet (14) and an outlet (28) for gas to be compressed, a particle pre-filter (16) arranged downstream of the inlet (14) in the flow direction of the gas to be compressed, an ultraviolet irradiation unit (22) which is configured to emit ultraviolet light and is arranged downstream of the particle pre-filter (16) in the flow direction of the gas to be compressed, and a ballast (40) which is configured and arranged to control the ultraviolet irradiation unit (22). The filter unit (10) is designed in such a way that the gas to be compressed which is fed in at the inlet (14) first passes through the particle pre-filter (16), is then irradiated by the ultraviolet irradiation unit (22) and can finally be fed to the compressor through the outlet (28). The invention also relates to a compressor comprising such a filter unit (10) and to a method for compressing breathing air using such a compressor.

In certain exemplary embodiments, an air purifier comprises a housing defining an enclosure and having an air entrance and an air exit; a particulate filter; a NCCO filter material configured to adsorb and decompose at least one gaseous pollutant; an AOG configured to generate at least one oxidant; an oxidant remover configured to remove at least one oxidant; a fan unit configured to generate airflow from the air entrance to the air exit; wherein the particulate filter, the NCCO filter material, the AOG, the oxidant remover and the fan unit are positioned within the enclosure such that during operation, a flow of air passes from the air entrance to the air exit through the particulate filter and the NCCO filter material along a direction of the flow of air. In certain embodiments, the air purifier may ensure safety to users while efficiency in removing contaminants can be greatly improved.

Air to be inhaled by a user can be treated to remove contaminants by passing the air through a multistage treatment system. The multistage treatment system can include an inhalation treatment unit for treating air to be inhaled by the user, a mask wearable on the user's face, and an exhalation treatment unit for treating air exhaled by the user. The inhalation treatment unit and the exhalation treatment unit can each include various sub-units and assemblies for removing naturally occurring vapors and pathogens as well as compounds generated by operation of the treatment system.

A device for purifying air using UV light. In one embodiment, a device includes: a housing, the housing at least partially defining an air flow path and an inner chamber, the air flow path including at least one linear air flow segment and at least one non-linear air flow segment; a UV chamber within the inner chamber, the UV chamber at least partially defining the at least one non-linear air flow segment; a plurality of structural features within the UV chamber, each of the plurality of structural features creating at least one transition area, each of the at least one transition area being configured to change a direction of an air flow within the at least one non-linear air flow segment; and at least one UV bulb, each of the at least one UV bulb being positioned proximate a one of the at least one transition area.

A system for providing filtered air to an enclosed space includes a first air feed pump to pull air from an environment and push pressurized air to the enclosed space, a power source adapted to provide electrical power to the first air feed pump, a first filter media positioned between the first air feed pump and the enclosed space to provide coarse filtration of the pressurized air pumped from the first air feed pump through the first filter media and remove particles that are larger than approximately 5 microns, and a second filter media positioned between the first filter media and the enclosed space to provide fine filtration of the pressurized air pumped from the first filter media through the second filter media and remove particles that are between 1 nanometer and 20 nanometers in size.

A filter section of a heating, ventilation, and air conditioning (HVAC) system includes a plurality of filters arranged in series relative to a flow path of air through the filter section. The plurality of filters includes at least one movable filter transformable between an extended position arranged within the flow path of air and a retracted position removed from the flow path of air. At least one movement mechanism is operably coupled to the at least one movable filter to transform the at least one movable filter between the extended position and the retracted position.

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.