A filter may remove PM.sub.2.5 and/or other airborne pollutants, which filter has fibers of an average diameter of no more than 500 nm, the fibers of at least 90 wt. % polyacrylonitrile, relative to all fibers in the filter; and a catalyst of at least 90 wt. % TiO.sub.2, relative to all catalytic metals in the filter, dispersed onto the fibers. The fibers need not be charged. The TiO.sub.2 may be condensed or precipitated onto the fibers out of a liquid containing the TiO.sub.2 and the fibers by simple methods. The catalyst may be activated by UV irradiation to decompose particulate matter having an average particle size of 2.5 μm or less, i.e., PM.sub.2.5, and/or other airborne pollutants from air. Such filters may be implemented around areas of vehicle traffic, e.g., as elements of traffic lights, and may be used to controllably purify polluted air.

An air purification system and air purification method for the dynamic filtering and static sterilization and disinfection of a central air conditioner, the purification system comprising a first sterilization and disinfection purification device (100), a second sterilization and disinfection purification device (200) and an air circulating device. The first sterilization and disinfection purification device (100) and the second sterilization and disinfection purification device (200) respectively control, according to different operation procedures, the opening and closing of valves (101, 201) that are respectively configured. The first sterilization and disinfection purification device (100) and the second sterilization and disinfection purification device (200) each comprise a filtering unit (103), an adsorption barrier unit (104), a static electret unit (107), a sterilization and disinfection unit (105) and an internal air circulating unit (106). The purification system filters, purifies and sterilizes and disinfects the air, thereby improving the ventilation environment and the ecological environment.

A method for building a soundproof enclosure (10) in the form of an independent structure with acoustic properties for isolating noise and vibration is disclosed. The soundproof enclosure (10) comprised a plurality of acoustical wall panels (12) interconnectable each to another at opposing sides for enclosing an interior space (41) of various sizes. The soundproof enclosure (10) further comprised one or more modular multilayer ceiling unit(s) (13) assembled onto the top edges of the acoustical wall panels (12) to form the enclosure. The ceiling unit (13) comprised a plurality of ceiling layers (17), each ceiling layer (17) being vertically spaced apart with one another by brackets to topographically form the multiple guided spaces necessary for air flow circulation within the enclosure (10). These guided spaces can also house multiple implements such as circulation fan, air filter and sound silencer. Sound insulating material layer(s) are interposed between the contacting surfaces of the ceiling unit (13) and the acoustical wall panels (12) and/or all around the surfaces to isolate and decouple the ceiling unit (13) from the acoustical wall panels (12) from vibrations. A sound barrier cover (16a or 79) is interposed at the openings (25) of the air passages (24) to further reduce the sound level emitted into and exiting from the enclosure. In addition, a construction method by elevating the heavy acoustical wall panels (12) and the ceiling units (13) until they fall into precise assembly location for ease of assembly of the components of the enclosure (10) and a floor base unit 11 that enabled the enclosure (10) to about easily in whole is also disclosed. Furthermore, a method to ease assembly of the enclosure (10) by use of removable heavy-duty handles (87) is disclosed.

A bipolar ionizer comprising an electronic circuit, microprocessor, and step-up transformer providing high-voltage signals to carbon-fiber electrodes producing bipolar ion concentrations greater than +/−200 million ions per cubic centimeter. The bipolar ionizer monitors, reduces, and converts high-voltage signals to feedback signals used by the microprocessor to vary a frequency and a duty cycle of a digital signal to control an excitation signal for a step-up transformer output voltage to consistently maintain an unbalanced high-voltage output ratio less than 80 percent, balanced bipolar ion concentration ratio greater than 80 percent, and zero ozone concentration over a range of electrical signal inputs. The microprocessor calculates and reports bipolar ionizer concentrations based on feedback signals. The microprocessor monitors concentrations of Volatile Organic Compounds (VOCs) in an airflow serving the bipolar ionizer and adjusts the positive/negative DC high-voltage signals and bipolar ion concentration when VOC concentrations are above a threshold.

A screen cover device and an air-cleaning device configured to be used together with such a screen cover device, wherein said screen cover device is configured for holding at least one disposable screen cover which when in use, is configured for covering at least a substantial part of an air outflow area of a screen of the air-cleaning device, wherein said screen cover device is provided as an attachment to the air-cleaning device and comprises: at least one disposable screen cover; and a first unit which is configured for keeping the at least one disposable screen cover when not in use and which is configured to be mounted to the air-cleaning device.

A method of a fan system directing an air stream at a target can include receiving, with a controller, a first image from an image capture sensor and analyzing the first image from the image capture sensor to determine a first location of the target. The method can also include receiving a second image from the image capture sensor and analyzing the second image from the image capture sensor to determine a second location of the target. The method can also include comparing the first location of the target and the second location of the target and sending a signal to a first motor to rotate a housing about a first axis respective to a base to direct an air stream exiting an outlet of a channel at the target.

An indoor air quality control method using an intelligent air cleaner is disclosed. An indoor air quality control method using an intelligent air cleaner according to an embodiment of the present invention classifies dust concentration data received from the air cleaner according to predetermined criteria and performs dust concentration pattern analysis. Particularly, dust concentration patterns for respective time periods are analyzed to control the air cleaning intensity of the air cleaner in advance of a predicted time, thereby facilitating efficient indoor air quality management. The intelligent air cleaner and the indoor air quality control method using the same of the present invention can be associated with artificial intelligence modules, devices related with the 5G service, and the like.

An indoor air quality control method using an intelligent air cleaner is disclosed. An indoor air quality control method using an intelligent air cleaner according to an embodiment of the present invention classifies dust concentration data received from the air cleaner according to predetermined criteria and performs dust concentration pattern analysis. Particularly, dust concentration patterns for respective time periods are analyzed to control the air cleaning intensity of the air cleaner in advance of a predicted time, thereby facilitating efficient indoor air quality management. The intelligent air cleaner and the indoor air quality control method using the same of the present invention can be associated with artificial intelligence modules, devices related with the 5G service, and the like.

A method, an air treatment device and a system associated with determining a degree of utilized capacity of a filter for processing air present in an ambient volume. Determining a total accumulated pollutant amount in the filter. Comparing the determined total accumulated pollutant amount to a reference pollutant amount to determine the degree of utilized capacity. The reference pollutant amount is a pollutant amount present in the filter when the air treatment device produces a predetermined clean air flow. The accumulated pollutant amount in the filter is determined based on data obtained from a sensor arranged to measure a current pollutant concentration in the ambient volume and/or pollutant concentration data indicative of a current pollutant concentration in the ambient volume and an estimated volume of air processed by the air treatment device. The volume is estimated based on a current air flow through the filter.

The present inventive concept relates to an air treatment device adapted to treat air in a confined space. The air treatment device comprises a device body having a central axis, the device body comprising a supporting structure being substantially transverse to the central axis and a side section being substantially parallel to the central axis. The air treatment device further comprises an air treatment section arranged in the device, an ionizing arrangement, a fan arrangement, and a filter extending in a first direction being parallel to the central axis, wherein the filter comprises an upper end and a lower end in the first direction, wherein the ionizing arrangement and the fan arrangement are arranged between the upper and lower end.