A face mask is provided. The mask comprises a body defining an interior side and an exterior side of the face mask; a one-way inlet valve that only allows gas to pass from the exterior side of the body to the interior side; and a one-way outlet valve that only allows gas to pass from the interior side of the body to the exterior side. By providing a face mask configured in this manner, the mask is able to provide fresh air to the wearer while reducing the likelihood of contamination by pathogens or other toxic matter.

An ozonising module (1, 100) is disclosed having a housing (1a, 1b, 107) wherein an ozone generator assembly (3, 101) is accommodated, furthermore comprising at least an ozone sensor (4, 102) connected to a control unit (C) apt to control said ozone generator (3, 101) based on a time scheduling and a comparison between an ozone threshold concentration and a concentration signal from said ozone sensor (4, 102), ozone reduction means consisting of a filtering assembly with catalytic action (103) or a reducing assembly employing UV sources (113) through which an airflow is caused to flow by means of respective controlled ventilation means (103a).

The present invention relates to a system for protecting medical personnel and/or a patient from airborne pathogens in a surgical environment and a method for protecting medical personnel and/or a patient from airborne pathogens in a surgical environment.

The ionizer feedback control converts high-voltage signals to feedback signals to monitor the corresponding high-voltage signals and compares the feedback signals to a first specification to determine whether the feedback signals are within the first specification. The ionizer varies a frequency and a duty cycle of a digital signal to control an excitation signal for a step-up transformer and modulates the frequency and the duty cycle of a step-up transformer output voltage to consistently maintain the feedback signals within the first specification and maintain the high-voltage signals within a second specification to generate consistent ion concentrations over a range of electrical signal inputs. The microprocessor calculates and reports high-voltage signals, and ion concentrations based on feedback signals. The microprocessor monitors concentrations of Volatile Organic Compounds (VOCs) in an airflow serving the ionizer and adjusts the high-voltage signals and ion concentration when VOC concentrations are above a threshold.

A breathing apparatus may include a heater, a UV light source, or other device configured to kill harmful organisms in air. The apparatus may include a vest, including a UV light source, a heating chamber disposed on the vest, and a cooling chamber disposed on the vest. The heating chamber may include a heat source, and the heat source may heat air disposed within the heating chamber to a predetermined temperature. The UV light chamber may include a light source, and the light source may expose air disposed within the UV light chamber to a light at a predetermined wavelength. The UV light chamber, heating chamber, and the cooling chamber may be in fluid communication. The apparatus may include a breathing tube, including a first end and a second end. The first end may connect to the cooling chamber or to the UV light chamber. The apparatus may include a breathing mask. The second end of the breathing tube may connect to the breathing mask. The cooling chamber and the breathing mask may be in fluid communication via the breathing tube. Alternatively, the UV light chamber and the breathing mask may be in fluid communication via the breathing tube.

A portable air processing system that takes air from the ambient or other component, heats the air to a sufficient temperature so as to deactivate at least one type of pathogen or allergen, then cools the air to a comfortable breathing temperature, and then feeds this processed air under positive pressure to a controlled environment or mask covering the nose and mouth of a wearer, thus enabling one to breath cleaner air from a controlled source while mobile or stationary.

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.

A recirculating warm air system configured to connect to an air inflatable product is provided. The system includes a first chamber and a second chamber. The first chamber includes a first air inlet and a first valve located at the first air inlet. The second chamber includes a second valve located between the first chamber and the second chamber, an air outlet, and a first hose connected to the air outlet. The second chamber further includes an air blower and a heater located between the air blower and the air outlet. The second chamber includes a second air inlet, a third valve located at the second air inlet, and a second hose connected to the second air inlet. The first hose and the second hose are configured to connect to the air inflatable product. The system further includes a processing unit configured to control elements of the system.

The invention relates to a filtering material permeable to air and impermeable to oral, nasal and/or ocular human liquid aqueous excretions, comprising at least one bundle, referred to as a hydrophobic bundle, of at least two hydrophobic sheets which are superimposed and each formed by porous paper, having a gsm substance less than 30 g/m.sup.2, each hydrophobic sheet being formed by cellulose fibres, referred to as cross-linked cellulose fibres, which are connected to each other by hydrogen bonds and by covalent bonds which are formed with at least one group of cross-linking atoms, characterised in that at least some of the hydroxyls of the cross-linked cellulose fibres which are not engaged in hydrogen bonds and which are accessible to the gases form a covalent bond with an acyl group with a hydrophobic chain.

A filter system for adsorbing an odor of a gas flow in an industrial process includes a filter module (1) with a layer (11) containing active adsorbent (3). The layer (11) includes a plurality of active adsorbent containing permeable bags (2) arranged in close proximity to each other.