An indoor unit for an air-conditioning apparatus includes a plurality of axial-flow fans arranged side by side in a horizontal direction below an air inlet. Further, the indoor unit includes a plurality of filters provided to the air inlet so as to be arranged side by side. A cleaning mechanism and a dust box are further provided to the air inlet. Further, the dust box is arranged at a position between adjacent filters and adjacent axial-flow fans.

An indoor unit for an air-conditioning apparatus includes a cartridge provided to an air inlet so as to be freely mountable and dismountable. The cartridge accommodates a filter so as to be freely movable in a fore-and-aft direction and has an opening port formed in one end portion in the fore-and-aft direction. A dust box is provided on a side of the end portion of the cartridge. The dust box includes a cleaning mechanism configured to clean the filter and a dust collecting portion configured to collect dust.

An air filter unit for purifying air. The air filter unit includes a filter body extending along an axis, a first filter frame and a second filter frame arranged on opposite ends of said filter body. Each of the first and second filter frame includes four elongated frame members turnably secured to each other. The four elongated frame members are turnably secured to each other such that the filter body could be arranged in a first and a second state. The first state is such that the filter body is folded to reduce the volume of the filter unit and the second state is such that the filter body is assembled.

An indoor unit for an air-conditioning apparatus includes a cartridge provided to an air inlet so as to be freely mountable and dismountable. The cartridge accommodates a filter so as to be freely movable in a right-and-left direction and has an opening port formed in one end portion in the right-and-left direction. A dust box is provided on a side of the end portion of the cartridge. The dust box includes a cleaning mechanism configured to clean the filter and a dust collecting portion configured to collect dust.

A filter for use at an airflow opening of bellows of a shock absorber. The filter device includes a filter body through which a gas, in particular air, can flow in in the direction of an air inflow direction and out in the direction of an air outflow direction. The airflow opening is a joint air inlet and air outlet opening. A fastening means is disclosed that is fitted with a filter, in particular a fastening ring fitted therewith, for fastening bellows to a shock absorber.

A switchable filtration system for a heating, ventilation, air conditioning, and refrigeration (HVACR) system is disclosed. The filtration system includes a first filter, a second filter, a switching apparatus, and a controller. The controller is configured to determine an air quality score. When the air quality score exceeds a predetermined threshold, the controller controls the switching apparatus to switch the first filter out of an active airflow path. When the air quality score is at or below the predetermined threshold, the controller controls the switching apparatus to switch the first filter into the active airflow path.

A fan coil and an air purification system. The fan coil includes: a housing, the housing provided with an air inlet, a fan inside the housing which air enters via the air inlet and a coil unit; and a purification unit located near the air inlet for filtering air, the purification unit includes a filter cartridge holder that detachably fixes a filter cartridge, and a conveyer that is attached to the filter cartridge holder and moves the filter cartridge to a place accessible to personnel.

A method for cleaning a particulate matter filter is discussed. The particulate filter can include an inlet and an outlet, where the outlet includes openings to a plurality of outlet channels, and the inlet includes openings to a plurality of inlet channels. The outlet channels and the inlet channels are separated by a filer barrier. A fluid nozzle is positioned in contact with the outlet of the particulate filter over a first set of outlet channels. Fluid form the fluid nozzle is injected into the first set of outlet channels. While injecting the fluid, the position of the fluid nozzle is changed such that the fluid nozzle is positioned over a second set of outlet channels.

The present disclosure relates generally to air intake filter assemblies, and more particularly to air intake assemblies for an outdoor portion of a heating, ventilation, and/or air conditioning (HVAC) system. In an embodiment, a filter assembly is configured to filter an airflow entering an air intake of a HVAC unit. The filter assembly includes a support structure and a plurality of filter slats, each having a fine filtration material, each disposed within the support structure, and wherein the plurality of filter slats is configured in a louvered relationship and actuated between a closed configuration through which the airflow passes and an open configuration through which the airflow passes.

An in-line vacuum filter comprises a manifold having an inlet, an outlet, a collecting container, and an actuatable filter paddle. A flow of air generated by a source of negative pressure travels from the inlet to the outlet. The actuatable filter paddle is positioned within the manifold such that it can be actuated between a first position and a second position. In the first position, the actuatable filter paddle is placed within the flow of air and in the second position, the actuatable filter paddle is removed from the flow of air. The filter paddle is preferably arcuate concave and comprises a plurality of apertures. In the first position, the filter paddle gradually diverts objects larger than a width of the apertures away from the flow of air. Diverted objects may travel to a removable collection container.