There is provided a fan assembly comprising a fan body comprising a first air inlet and a second air inlet, the first air inlet and the second air inlet being provided on opposing halves of the fan body. The fan assembly also comprises a first filter assembly mounted on the fan body over the first air inlet, and a second filter assembly mounted on the fan body over the second air inlet. The fan body further comprises a first retention assembly that is configured to releasably engage both the first filter frame and the second filter frame, and a second retention assembly that is also configured to releasably engage both the first filter frame and the second filter frame.

An air filtering system having: an air box, which has at least one inlet opening and at least one outlet opening; and an air filter, which is arranged inside the air box. The air box has two opposite twin mounting openings, which are obtained in two parallel and opposite walls of the air box and are shaped to allow the air filter to be inserted and removed through each one of them. Two removable doors are provided, each having an outer panel configured to overlap a respective mounting opening to close the mounting opening and two inner appendages, which project perpendicularly from two opposite ends of the outer panel so as to be arranged on the two opposite sides of the air filter, when the door is coupled to the respective mounting opening.

A reusable face mask with a foam face seal to protect against transmission of airborne pathogens. The face mask uses an easily interchangeable, readily available, non-proprietary, standard filter. It has a section specifically designed to mitigate the fogging of glasses, and has a user-interchangeable strap/harness system.

One aspect of the technology relates to a recirculation filter. The recirculation filter has a first outer layer defining at least a portion of a first flow face of the recirculation filter, where the first flow face is configured to be positioned adjacent to a sensitive component in an electronics enclosure. A second outer layer defines at least a portion of a second flow face of the recirculation filter. A filter material layer is disposed between the first outer layer and the second outer layer. The filter material layer has a central region, wherein a substantial portion of the central region is offset from the first flow face of the recirculation filter. Other aspects are also described.

The filter device includes a supply air introducing part, a filter main body part and a discharge part. The supply air introducing part takes in an outside air. The filter main body part includes a ventilation pipe connected to the supply air introducing part to allow the outside air to flow through the ventilation pipe and a filter housing part being equipped with an outflow hole allowing the outside air to flow outside at a position higher than a position of the opening part of the ventilation pipe to separate, from the outside air, a liquid in a liquid state or a state close thereto. The liquid is taken in together with the outside air. The discharge part discharges at least the separated liquid from the filter main body part.

A hand vacuum cleaner may have a first stage cyclone having a first stage cyclone chamber and a second stage cyclone downstream from the first stage cyclone and at least substantially nested in the first stage cyclone. A screen is positioned laterally outwardly from the second stage cyclone and defines a passage positioned between an inner side of the screen and the outer wall of the second stage cyclone. A directing member is located in the passage, the directing member having, in the rotational direction, a directing surface facing towards the flow of air in the passage, the directing surface extending from an upstream end located in the passage and a downstream end located proximate the second stage cyclone air inlet port wherein the directing surface extends generally linearly.

A filter assembly for a vacuum cleaner has a housing, a filter medium disposed in the housing, a recess formed in a surface of the housing, a tab movable between a first position and a second position, and a fixing member movable between a fixing position and a release position. The fixing member is engageable with the vacuum cleaner when in the fixing position to fix the filter assembly to the vacuum cleaner. The fixing member is disengageable from the vacuum cleaner when in the release position such that the filter assembly may be removed from the vacuum cleaner. The tab is movable between the first and second positions to move the fixing member between the fixing and release positions. The tab is disposed within the recess such that the tab is located below the surface of the housing in the first position.

The present invention relates to a fibrous dispersion and filtration air outlet system. A fibrous dispersion and filtration air outlet system comprises of an air outlet basket with a tumbling chamber, coupled with a vented base. Airflow from an HVAC air supply duct is channeled through a fibrous dispersion and filtration air outlet system, the airflow is tumbled, filtered of particulates and dispersed uniformly through the plurality of microscopic apertures of the filtration medium upon exiting the system.

A reusable face mask for covering the mouth and nose of a wearer to prevent the passage of pathogenic biological airborne particulates. The mask has three layers including a filter material made of graphene and infused with activated copper carbon. A Bluetooth transmitter wirelessly transmits a continuous frequency of 2.4 GHz to destroy and prevent the passage of any human pathogens from entering, while freely allowing the passage of air in both directions.

A filtering element, a dust collection pile, and a cleaning system are disclosed. The filtering element includes a frame and a filter screen. The filter screen id disposed on the frame. A receiving groove is formed on the filter screen. The receiving groove includes a first opening, a second opening, and a third opening, wherein the first opening and the second opening are provided opposite to each other, and both ends of the third opening penetrate through the first opening and the second opening.