A pulse modulated oxygen dispensing and pressurization system provides a variable range of controlled oxygen bolus to an enclosed breathing environment supporting and maintaining required pressure conditions in accordance with desired flow demand. As oxygen is consumed by the user from within the enclosed breathing environment, the exhaled gases and moisture are conditioned or vented to acceptable levels by additional systems associated with the environment. These additional systems cause an ongoing need to replenish the oxygen within the environment and maintain the required partial pressure of oxygen. Specific to one of a plurality of modes of operation, the system responds to changes in regulated output pressure by delivering a precisely metered periodic bolus volume of oxygen to support a requirement of the environment volume. The bolus is variable based on a plurality of factors to increase and decrease changes in rates of flow required to maintain regulated pressure.

A back carrier of an air respirator includes a cooling conduit section having a meandering metal conduit. The cooling conduit section is interposed between a branching port having a pressure reducing valve built in and a medium-pressure hose. Breathable gas that is filled in a cylinder at high pressure, and adiabatically expanded via the pressure reducing valve flows into the cooling conduit section so as to exert a cooling effect around the cooling conduit section. Such an air respirator can be used for protective clothing and also for fireproof clothing.

An air breathing device includes a casing and an air passage cavity encompassed by the casing. The device includes a set of air intake ports and air discharge ports that connect the air passage cavity to the outside of the casing. The device includes a set of dampers that allow the air to flow into the air passage cavity during inhalation through the air intake ports. The device includes a set of dampers that allow the air to exit the air passage cavity during exhalation through the air discharge ports. The device includes a retractable display screen to display content to the wearer. The device includes a fixed display screen to display images of the mouth of the wearer captured by a camera lens or simulated based on captured voice of the wearer. The device includes UV lights, filters, network connections, camera lenses, speakers, microphones, ear plugs, and heating coils.

A patient interface includes: a plenum chamber; a seal-forming structure; a positioning and stabilising structure; a plenum chamber insert configured to be positioned and retained within the plenum chamber; and a vent structure; wherein the plenum chamber insert has a plenum chamber insert port; wherein the plenum chamber insert has an exterior surface configured to be positioned adjacent to an interior surface of the plenum chamber; wherein when the plenum chamber insert is positioned and retained within the plenum chamber, a radial channel is formed by the interior surface of the plenum chamber and the exterior surface of the plenum chamber insert such that gas is able to pass between a patient-proximal side of the plenum chamber insert and a patient-distal side of the plenum chamber insert via the radial channel during use.

An air purifying mask having a face mask along with components some of which are arranged inside a casing. The casing may contain an air filtering system, along with other associated components for the mask including blower, appropriate pressure, flow control and filtration settings, and heating control. A flexible attachable/detachable connecting coaxial duct for inhale and exhale, may connect the mask and the air filtration system. The system may have a heating element for self-cleaning and temperature control. The heating element may also help for disinfection of air path within the system and air mask.

A cooling purified air breathing system for use during activity or in warm environments. The system includes a wearable portable air purifier having an opening for discharging cooling air, and a face mask configured to cover at least a user's nose and mouth. Air tubing is used to direct cooling filtered air into the mask, either through an opening or via a clip and connector attached to an edge of the mask. The air purifier is preferably worn in close proximity to the mask, such as around the back of the neck of the user.

A ducted breathing apparatus and methods for assembling and using such ducted breathing apparatus are provided. The ducted breathing apparatus may include a face cover for sealing at least a portion of a user's face. The ducted breathing apparatus may include a ducted air channel element for providing direct air flow from a user's mouth within the mask to the outside environment. The ducted breathing apparatus may include a coupling element for providing a sealed mating connection between the ducted air channel element and the face cover.

An oxygen concentrator (100) may have a moisture conditioning system. In some implementations, the concentrator includes a compressor to induce feed gas into the concentrator. A first pathway may receive the feed gas from the compression system. The first pathway may be configured to draw moisture to produce moisture reduced feed gas. The first pathway may lead the moisture reduced feed gas to sieve bed(s) which produce oxygen enriched air with the moisture reduced feed gas. An accumulator may be configured to receive the produced oxygen enriched air from the sieve bed(s). A second pathway from the accumulator may apply the drawn-out moisture to the produced enriched air to produce humidified enriched air. A third pathway may transfer the drawn-out moisture from the first pathway to the second pathway. An outlet coupled with the second pathway may release the humidified enriched air from the concentrator for a user.

A multifunctional face mask assembly apparatus to help to prevent or reduce heat-related illness for individuals working in high temperature environments. Fastened to the face, head and neck, to provide a cool ambient microclimate and/or aid in lowering skin temperature around the face, head and neck to aid in cooling the regulation of cerebral blood flow by means of the Hypothalamus which is responsible for regulating body temperature. The multifunctional face mask assembly use ice cooling technology to help lower temperatures when experiencing hot flashes, aid in reducing the onset of a fever, aid in improving performance by means of pre-cooling, intermittent cooling, per/mid-cooling or post-cooling during exertional sports, fitness and/or exercises, use in Cooling Centers to lower temperature around the face, head and neck. The apparatus is optionally housed, secured or attached within the nose cup cavity opening of an elastomeric half facepiece reusable respirator, full facepiece respirator, resistance training mask, dust particle mask or face mask. The apparatus is optionally use to housed, secured or attached to handheld/portable Nebulizer mask, elastomeric half facepiece reusable respirator, resistance training mask, dust particle mask or face mask nose cup. The apparatus is fashioned, designed, shaped or configured for use as a Helmet Face Covering for (e.g., professional, college, schools, recreation, entertainment, leisure or, outdoor recreational activities).

Provided is a powered air blower unit for delivering air flow to a user with constant air flow or varying speeds of air flow. The air blower unit may also include a filter for purifying the air.