The indoor unit of a mini-split heat pump has an auxiliary filter mounted atop the air inlet opening of the indoor unit. The auxiliary filter comprising three parallel filtering stages and each of these filtering stages having an air flow capacity equivalent to a nominal air flow rating of the indoor unit. The three filtering stages improve low-air-quality tolerance of a residential indoor unit of a mini-split heat pump, so that commercial and industrial users can also benefit from these high efficiency heat pumps to reduce their carbon footprint.

An apparatus and a method for cleaning a stream. The apparatus having at least one hot filtration device, which includes a filter vessel and at least one filter candle located inside the filter vessel, an inlet of medium in an upper part of the filter vessel for supplying the medium including particles to the filter vessel, an outlet of the medium in the bottom part for discharged the medium from the filter vessel, a moving bed including the medium which is arranged in the vessel so that the filter candle is inside the moving bed, at least one feed inlet for supplying the stream to the filter vessel, and at least one gas outlet for supplying a purified gas out from the filter vessel.

A filter device including at least one filter element adapted to filter a raw fluid and having a raw fluid side and a clean fluid side, the filter element having a clean fluid outlet arranged on the clean fluid side and extending in a first plane, at least one clean fluid collecting channel into which the clean fluid outlet opens; at least one compressed-air cleaning-off device adapted to generate a pressure pulse for cleaning-off foreign matter adhering to the filter element and to conduct the same through the clean fluid outlet to the filter element, wherein the compressed-air cleaning-off device is adapted to conduct the pressure pulse at least approximately along the first plane to the clean fluid outlet, wherein the compressed-air cleaning-off device comprises a compressed-air supply channel operationally coupled to a clean fluid collecting channel outlet and adapted to charge the clean fluid collecting channel with pressure pulses.

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.

The present invention discloses a smoke filter device, which comprises a plurality of oil filter sections (10), each oil filter section (10) has at least two filter holes (11); and in the two adjacent two filter holes (11), an area defined by the filter hole (11) near the at the end of the oil filter section (10) is smaller than an area defined by the filter hole (11) near the middle portion of the oil filter section (10). The present invention also discloses to a range hood with the smoke filter device. In the present invention, without changing the overall air volume, the suction force of the filter holes at the end of each oil filter section is increased, so that the smoke can be further prevented from escaping to the surrounding.

A dust extraction unit is disclosed including a first and a second air filter removable and mountable within the dust extraction unit and a body defining an air flow path which passes through the first and the second air filters when the first and the second air filters are mounted within the body of the dust extraction unit. The body of the dust extraction unit includes a first portion operable to receive the first air filter and a second portion operable to receive the second air filter. The first and second portions are connected by a hinge so that the first portion is moveable between a first configuration in which the first and second portion define an air flow path through the dust extraction unit and a second configuration which provides access to the portion of the dust extraction unit operable to receive the second air filter.

Disclosed is glue-free airtight filtering equipment comprising a filter housing, a plurality of filter elements and a plurality of receiving supporting elements, each filter element having a filtering surface, the plurality of filter elements being detachably disposed in the filtering space in a manner that the filtering surface is parallel to the upper surface and the bottom surface of the filter housing, and the plurality of receiving supporting elements allocating on an inner wall of the filter housing and being spaced apart from each other with a designated distance so as to correspondingly receive and support the plurality of filter elements, wherein a gap is provided between the filter element and the inner wall of the filter housing, and the filtering surface of the filter element and the maximum value of the gap satisfy a relational expression.

A sorption filter cartridge for a sorption filter element includes a fluid permeable housing. The housing encloses a plurality of housing rooms that are separated from each other. Each housing room receives at least two layers of non-woven fiber material and a granulate portion comprising at least one sorbent. The granulate portion is sandwiched between the at least two layers.

Methods and systems are provided related to an emissions control system. The emissions control system has an exhaust after-treatment system defining a plurality of distinct exhaust flow passages through which at least a portion of an exhaust stream can flow, e.g., the exhaust stream is produced by an engine. The emissions control system also includes a controller for controlling injection of reductant into the exhaust stream flowing through each of the flow passages. In one example, the emissions control system is configured for use in a vehicle, such as a locomotive or other rail vehicle.

Methods and systems are provided related to an emissions control system. The emissions control system has an exhaust after-treatment system defining a plurality of distinct exhaust flow passages through which at least a portion of an exhaust stream can flow, e.g., the exhaust stream is produced by an engine. The emissions control system also includes a controller for controlling injection of reductant into the exhaust stream flowing through each of the flow passages. In one example, the emissions control system is configured for use in a vehicle, such as a locomotive or other rail vehicle.