The present disclosure relates to air filters. More particularly, it relates to air filters including pleated filter media that can be uniformly expanded and contracted. In some embodiments, the air filters are adjustably sized air filter systems. In some embodiments, the air filters can be used in a window opening.

The invention is a table top filtration device designed to filter noxious fumes on or near the table. In one embodiment, the tables are manicure and pedicure tables.

A system and method for maintaining, monitoring and improving air quality and purity in a room or environment, such as a hospital room or operating room.

Filter media comprising adsorptive particles are generally described. In some embodiments, the adsorptive particles are present in a relatively large amount, in a layer discrete from one or more other layers and/or fiber webs also present in the filter media, and/or in a layer that comprises a relatively low amount of fibers. In some embodiments, the filter media further comprises a non-woven fiber web comprising fibers with relatively small diameters.

A refrigerator includes a storage compartment having a front opening and an air sanitation device mounted on a top wall of the storage compartment. The air sanitation device includes: a housing, an air channel located in the housing, a fan, and an air detection device and/or an air purification device located in the air channel. The housing includes a front wall facing the front opening, a rear wall, an upper wall, a lower wall, and a pair of side walls. The air channel includes an air inlet and an air outlet. The fan is configured to force air to enter the air channel from the air inlet, and then be discharged out from the air outlet. The air inlet is located on at least one of the side walls, and the air outlet is located on the rear wall.

A filter includes a dust collecting unit, and the dust collecting unit includes: a filter media formed in a wrinkle shape including a plurality of bent parts folded up and down in a direction parallel to a plurality of parallel patterns and a connection part; a conductive coating layer pattern including a plurality of parallel patterns; and a first power source electrically connected to a first end and a second end of the conductive coating layer pattern and configured to apply a voltage, wherein the connection part connects the adjacent bent parts, a parallel pattern of the plurality of parallel patterns is disposed in the connection part, and the plurality of parallel patterns includes a first and a second adjacent parallel patterns, and a first current flowing through the first adjacent parallel flows in a direction opposite to a second current flowing through the second adjacent parallel pattern.

A macro electrically active mask includes two conductive layers separated by at least one filtering and insulating layer. The conductive layers are connected to each other by a power source. The power source includes an oscillator and a high voltage transformer. The power source generates a periodic voltage with a fundamental frequency and multiple harmonic frequencies. The power source is connected between the two conductive layers and the periodic voltage generates a periodic electric field between the two conductive layers. The fundamental frequency, the duty cycle, and the amplitude of the periodic voltage are configured to inactivate the microorganism that pass through the electric field.

A face mask with microporous filter membrane layer is presented. The face mask with microporous filter membrane layer contains a mask body at least one strap and a sealing element. The mask body contains a first end a second end an outer layer at least one intermediate layer and an inner layer. The first end and the second end are terminally positioned longitudinally opposite to each other along the mask body. The at least one strap is distributed about the first end and the second end. The sealing element is perimetrically connected along the outer layer inner layer and the at least one intermediate layer. The at least one intermediate layer is connected between the outer layer and the inner layer through the sealing element

A grilling machine is described, which comprises a base body, a plate, arranged on the base body and defining a cooking surface whereon foods to be cooked are laid, and heating means operationally associated with the plate for heating the cooking surface. There is also a circuit, associated with the plate, for treating the fumes produced during the food cooking process. The fumes treatment circuit comprises: a hood arranged above the plate, which comprises at least one suction mouth, a filtering unit fluidically connected to the hood, and at least one recirculation outlet fluidically connected downstream of the filtering unit and located near the plate. In this manner, the cooking fumes sucked in through the suction mouth of the hood are treated by the filtering unit in order to obtain a purified flow with a given percentage of humidity. The purified flow is then recirculated towards the cooking surface through the recirculation outlet in order to exert a humidifying action on the foods.

Systems and methods are provided for predicting failure of an air filter within an HVAC installation. Also provided are methods for calibrating the systems described. The system provided typically includes air filters and vents, and a processor at an application server configured to implement methods described. Each vent may include various sensors, such as a temperature sensor or a sensor for evaluating indoor air quality. The method may receive information about a total volume of air pumped by an HVAC system over time, determine the volumetric quantity of air passing through a particular filter, and compare that quantity of air to a threshold amount representing the lifetime, or some percentage of the lifetime of the filter. Where the system includes multiple vents and multiple filters, the system may implement a model for calculating the volumetric quantity of air associated with each individual filter.