A breathing air compressor having an inlet air ultraviolet C light radiation emitter and viral and bacterial filtration system for air introduced into the air compressor. The viral and bacterial filtration system includes a cylindrical housing that includes a UVC radiation emitter mounted in a flow-through UVC radiation chamber, an inlet air particulate filter, and a flowmeter for measuring the volume and rate of flow of air to destroy viruses and bacteria present in any air flowing through the UVC chamber that is input air to an air compressor. The air compressor is typically used for generating breathing air for persons such as firemen and SCUBA divers. A controller and monitor unit is connected to the UVC radiation emitter and the flowmeter to shut down the air compressor to prevent air starvation.

A method for sterilising an internal surface of an air purifier or filter media in an air purifier by subjecting said internal surface or filter media to an ion cloud.

A device for individual protection and isolation against pollutants and microorganisms comprises a protection element (1) of the face designed to be worn by the user to at least partially cover the face and a filtering group (2) of the air inhaled and/or exhaled by the user. The protection element (1) is adapted to cover at least the whole face of the user and has at least one mouth for the passage of air provided with a one-way check valve (7) suitable to selectively allow the entry and the exit of air from said protection element (1), said filtering group (2) comprising a filter body (4) housing a filter (15) for purifying the entering or leaving air and in fluidic connection with the inside of said protection element (1) by means of an access made in said protection element (1) distinct from said mouth, said filter body (4) having a first opening for drawing air from the outside and/or the expulsion of air towards the outside and a second opening for the delivery of the air into and/or the withdrawal of air from said protection element (1).

A dry diffuser is disclosed which avoids safety and transport issues typical of liquid diffusers, candles and wax melts and provides systematic controlled diffusion of fragrance (or other active material) over relatively long periods with a programmable user interface.

In various embodiments, an air purifier capable of destroying and deactivating airborne contaminants such as SARS-CoV-2 is described. The air purifier comprises a photocatalytic system comprising at least one photoactivated semiconductor photocatalyst and a lamp configured to irradiate and excite the at least one photoactivated semiconductor photocatalyst to generate reductive and/or oxidative reactive species from oxygen and/or water on the photocatalyst surface. In various embodiments, the photocatalytic system comprises a stack of PCB cards, each card having a photocatalytic layer disposed thereon, or a 3-dimensionally ordered macroporous (3-DOM) structure comprising an open cell lattice.

A smart air-purifier system to provide improved air quality in a negative pressure enclosure is disclosed. The system comprises a machine housing that encloses a filter unit to remove airborne particles. The filter unit includes a high-efficiency particulate air (HEPA) filter. The system further includes one or more sensors to monitor the air quality and maintain the random forest approach (RAQ) for predicting air quality, a server to store a plurality of real-time data of the air-purifier system, and a user device to access the plurality of data stored in the server. Further, the real-time data is analyzed using internet-of-things (IoT) to perform surveillance to capture and monitor infection prevention and control data using a mobile application. The system further comprises a four-node controller inside the machine housing configured to switch on and off the system. Also, the system further comprises one or more ultraviolet (UV) lamps and an ionizer.

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.

The present invention relates to the use of an ion exchanger for the removal and/or reduction of biological contaminants, such as viruses, bacteria and fungal spores, in gases and gas streams, such as room air and breathing air, and a corresponding method. In certain embodiments, the ion exchanger is a cation exchanger partially or substantially completely loaded with H.sup.+ ions or an anion exchanger partially or substantially completely loaded with OH.sup.− ions. Additionally or alternatively, the ion exchanger may be loaded with transition metal ions, such as titanium, copper and/or silver ions.

The present disclosure provides designs for an electrically heated respirator/face mask to kill or deactivate airborne viruses and bacteria by creating a seamless thermal and/or humidity chamber/barrier around the wearer's nose and mouth area; in addition to efficiently filtering the tiny particles according to NIOSH N95 standards, it reduces the chance of contracting the disease. The designs include various combinations: a disposable or reusable N95 respirator with or without an exhalation valve, disposable or reusable medical face mask, both with or without integrated and replaceable filter layers, and a reusable respirator with filter cartridges. Each design is comprised of multiple layers with an active thermal filter with a heating element, which is made of graphene. The respirator is connected via a USB cable to a power unit. A control module is used to turn the device on and off and control the inner temperature and humidity optionally through sensors.

Methods of capturing respiratory droplets are provided which use coatings comprising a polyelectrolyte polymer and a viscosity modifier. In embodiments, a method of capturing respiratory droplets comprises absorbing respiratory droplets on a surface of a coating, the coating comprising a polyelectrolyte polymer and a viscosity modifier, wherein absorbed droplets leave depressions in the surface of the coating. Coated substrates and coating compositions used to form the coated substrates are also encompassed.