A headgear is described that includes a first air purifier, a second air purifier, a first microphone, a second microphone, and a control unit. The control unit analyses a first signal output by the first microphone and a second signal output by the second microphone to determine a direction of wind. The control unit then controls the relative flow rates of the first air purifier and the second air purifier in response to the determined direction of wind.

A personal air filter device with an air filter assembly retained in the air filter holding member is disclosed. An ear support member is attached to the air filter holding member and can be hung over the ear of the user to support the air filter holding member. Alternatively, a clip member attached to the air filter holding member can be utilized to attach the device to the user's clothing or accessories. An air tube assembly extends from the air filter holding member to the mouthpiece for the purpose of breathing filtered air flowing through the air filter assembly. An air intake check valve situated near the end of the air tube attached to a mouthpiece retaining member and an air outflow check valve situated near the outer surface of the mouthpiece retaining member to ensure exhaled air is directed out of the device and is not reinhaled.

Disclosed is an apparatus for providing controlled flow of inhalation-air from at least an air-reservoir to a mask. The apparatus includes a control unit and a switch unit. The control unit controls the level of the inhalation-air flowing from the air-reservoir to the mask. The control unit includes a housing to receive the inhalation-air from the air-reservoir, plurality of ducts protruding from the housing to connect with the air-reservoir and with the mask and a valve configured to control the flow of inhalation-air from the plurality of ducts. The switch unit positions a valve to selectively open and close the plurality of ducts for regulating the flow of inhalation-air from the air-reservoir to the housing.

Apparatuses and methods reducing humidity in respiratory protective devices are provided. For example, an example respiratory protective device includes a humidity sensor component embedded in an exhalation filtration component of the respiratory protective device, at least one fan component positioned adjacent to an inhalation filtration component of the respiratory protective device, and a controller component in electronic communication with the humidity sensor component and the at least one fan component.

A mask for a patient and a method for reducing exposure of aerosol particles emitted from the patient to other individuals. The mask may have an inner chamber configured to enclose a nose and a mouth of the patient. The mask may further have a negative pressure chamber fluidly connected to the inner chamber. The negative pressure chamber may have an outer opening and a suction opening. The outer opening may be covered by a seal. The seal may be configured to be cut or opened to form a device opening providing access to the nose of the patient. The device opening may receive a medical device and form a seal around the medical device. The suction opening may be configured to couple to a suction device for removing the aerosol particles located within the inner chamber and the negative pressure chamber.

The invention provides a wearable air purification device which actively generates a propelled stream of purified air for direct delivery to a region proximal to a user's mouth or nose for their immediate inhalation. An air chamber comprises a flexible diaphragm adapted to fluctuate between two extreme positions, thereby altering the volume within the chamber and alternately sucking and blowing air into and out of the chamber. Filtration elements are arranged in said air chamber. The filtration elements are arranged so as to make fluid communication with air displaced into the air chamber and, to make fluid communication with air displaced out of said chamber so that air is cleaned as it passes both into, and out of, the air chamber. The filtration elements actively remove particulate or gaseous pollutants. Embodiments of the invention may comprise a plurality of such air chamber assemblies, arranged so as to collectively deliver a continuous flow of air to a breathing zone of the user.

There is provided a method of controlling a powered air purifying respirator blower system to deliver a substantially uniform volumetric airflow to a user, the system comprising a fan powered by a battery in communication with a variable speed electric motor, the variable speed electric motor is controlled by an electronic control unit for delivering a forced flow of air through at least one filter to a user, comprising the steps of: (a) determining an estimated system run time by summing a battery run time remaining and a system run time; and (b) altering a speed of the variable speed electric motor when the estimated system run time is equal to or less than a desired system run time.

An air-fed visor comprises a mask, at least part of which comprises a foam material. An air tube is provided for delivering air to the visor. An air distribution rose is disposed in the foam mask. The rose comprises an air inlet connected to the air tube and an air distribution chamber for distributing air from the air inlet into the foam material.

A protective apparel support system is disclosed comprising a support frame configured to rest on the shoulders of a wearer, the support having a first shoulder member, a second shoulder member and a shield engagement portion. A shield is selectively coupleable to the support and protective apparel is coupled to the shield.

There is provided a method of controlling a powered air purifying respirator blower system to deliver a substantially uniform volumetric airflow to a user, the system comprising a fan powered by a variable speed electric motor, the motor is controlled by an electronic control unit for delivering a forced flow of air through at least one filter to a user, comprising the steps of: (a) monitoring system loading; and (b) decreasing a speed of the electric motor when system loading reaches a predetermined value. There is also provided an air purifying respirator blower system using such a method.