A filter unit heat exchanger is provided that may include a housing substantially surrounding a heat exchange assembly. Provided through the housing are one or more tortuous fluid flow paths used to direct airflow therethrough around portions of the heat exchange assembly for efficient operation. The tortuous path(s) may be provided by one or more nozzle openings on an input side of the housing and one or more diffuser openings on an output side of the housing, where the nozzle openings and diffuser openings are offset to cause desired airflow deflection. The filter unit may include desired symmetries to improve manufacturability and/or installation.

A fume collecting assembly, a range hood, a side suction range hood, a range hood for two-sided fume collection and central air intake, a range hood with partition, and a central fume purification device are provided. The fume collecting assembly includes a fume collecting panel having curved recessed portion and an air deflector, which has curved protruding portion and is connected to the fume collecting panel, and the curved protruding portion is opposite the curved recessed portion, forming first air inlet and second air inlet spaced apart. The fume collecting panel includes a fume collecting port for discharging fumes into a duct of range hood. The first air inlet and the second air inlet both communicate with the fume collecting port. The range hood, the side suction range hood, the range hood for two-sided fume collection and central air intake, and the range hood with partition include the fume collecting assembly.

An air cleaner and an oil mist filter are disclosed. The air cleaner includes a main body, and a filter device. The filter device includes at least one dust filter configured to filter external air and an oil mist filter configured to filter oil mist. The oil mist filter includes a stationary filter including a plurality of first baffles, and a movable filter including a plurality of second baffles respectively corresponding to the plurality of first baffles. The movable filter is movably disposed on one side of the stationary filter to be moved to first or second position. The oil mist filter is provided with a first air path in the first position, the first and second baffles are positioned closest to each other. The oil mist filter is provided with a second air path in the second position, the first and second baffles are farthest away from each other.

A fume collecting assembly, a range hood, a side suction range hood, a range hood for two-sided fume collection and central air intake, a range hood with partition, and a central fume purification device are provided. The fume collecting assembly includes a fume collecting panel having curved recessed portion and an air deflector, which has curved protruding portion and is connected to the fume collecting panel, and the curved protruding portion is opposite the curved recessed portion, forming first air inlet and second air inlet spaced apart. The fume collecting panel includes a fume collecting port for discharging fumes into a duct of range hood. The first air inlet and the second air inlet both communicate with the fume collecting port. The range hood, the side suction range hood, the range hood for two-sided fume collection and central air intake, and the range hood with partition include the fume collecting assembly.

A filter unit heat exchanger is provided that may include a housing substantially surrounding a heat exchange assembly. Provided through the housing are one or more tortuous fluid flow paths used to direct airflow therethrough around portions of the heat exchange assembly for efficient operation. The tortuous path(s) may be provided by one or more nozzle openings on an input side of the housing and one or more diffuser openings on an output side of the housing, where the nozzle openings and diffuser openings are offset to cause desired airflow deflection. The filter unit may include desired symmetries to improve manufacturability and/or installation.

An air cleaner and an oil mist filter are disclosed. The air cleaner includes a main body, and a filter device. The filter device includes at least one dust filter configured to filter external air and an oil mist filter configured to filter oil mist. The oil mist filter includes a stationary filter including a plurality of first baffles, and a movable filter including a plurality of second baffles respectively corresponding to the plurality of first baffles. The movable filter is movably disposed on one side of the stationary filter to be moved to first or second position. The oil mist filter is provided with a first air path in the first position, the first and second baffles are positioned closest to each other. The oil mist filter is provided with a second air path in the second position, the first and second baffles are farthest away from each other.

A filter unit heat exchanger is provided that may include a housing substantially surrounding a heat exchange assembly. Provided through the housing are one or more tortuous fluid flow paths used to direct airflow therethrough around portions of the heat exchange assembly for efficient operation. The tortuous path(s) may be provided by one or more nozzle openings on an input side of the housing and one or more diffuser openings on an output side of the housing, where the nozzle openings and diffuser openings are offset to cause desired airflow deflection. The filter unit may include desired symmetries to improve manufacturability and/or installation.