A filtration system and method for removing sub-micron particulates and contaminants from a fluid flow with the use of ultralow density metal and coated metal foams that have nanometer to micron scale pores that can trap fluid borne particulates. Filters can use metal foams and coated metal foams alone or in tandem. The size and density of the pores in the foam can be adjusted with synthesis conditions. Foams with pore size gradients can be provided where different sized particulates will be trapped at different regions of the foams. The metal and coated metal foams can also act as catalysts or substrates for absorption or adsorption for separation of target particulates and gases from an effluent or gas stream. The foams may be charged with a voltage to function as an ionization grid to transfer charge to charge neutral particulates to facilitate collection.

A filtration system and method for removing sub-micron particulates and contaminants from a fluid flow with the use of ultralow density metal and coated metal foams that have nanometer to micron scale pores that can trap fluid borne particulates. Filters can use metal foams and coated metal foams alone or in tandem. The size and density of the pores in the foam can be adjusted with synthesis conditions. Foams with pore size gradients can be provided where different sized particulates will be trapped at different regions of the foams. The metal and coated metal foams can also act as catalysts or substrates for absorption or adsorption for separation of target particulates and gases from an effluent or gas stream. The foams may be charged with a voltage to function as an ionization grid to transfer charge to charge neutral particulates to facilitate collection.

A filter system includes a first filter module having first filter module output ports near an outer perimeter of the first filter module and a first filter module center port on near a midpoint of the first filter module, a second filter module having second filter module outer ports near an outer perimeter of the second filter module and a second filter module center port near a midpoint of the second filter module, and a diverter between the first filter module and the second filter module. The diverter has an input port proximate to a midpoint of a top of the diverter and diverter exit ports proximate to an outer perimeter of a bottom of the diverter.

A filter system includes a first filter module having first filter module output ports near an outer perimeter of the first filter module and a first filter module center port on near a midpoint of the first filter module, a second filter module having second filter module outer ports near an outer perimeter of the second filter module and a second filter module center port near a midpoint of the second filter module, and a diverter between the first filter module and the second filter module. The diverter has an input port proximate to a midpoint of a top of the diverter and diverter exit ports proximate to an outer perimeter of a bottom of the diverter.

The invention pertains to an air filter element comprising a tubular main body having a first axial end surface and a second axial end surface; wherein said first end surface comprises a first engagement means and said second end surface comprises a second engagement means; said first engagement means and said second engagement means being configured to enter into releasable engagement such that said first engagement means releasably engages with a second engagement means of a like air filter element in axial alignment with said air filter element and said second engagement means releasably engages with a first engagement means of a like air filter element in axial alignment with said air filter element; whereby said releasable engagement is able to withstand an axial pulling force up to a first level and whereby said releasable engagement is released when subjected to a pulling force above a second level.

The invention pertains to an air filter element comprising a tubular main body having a first axial end surface and a second axial end surface; wherein said first end surface comprises a first engagement means and said second end surface comprises a second engagement means; said first engagement means and said second engagement means being configured to enter into releasable engagement such that said first engagement means releasably engages with a second engagement means of a like air filter element in axial alignment with said air filter element and said second engagement means releasably engages with a first engagement means of a like air filter element in axial alignment with said air filter element; whereby said releasable engagement is able to withstand an axial pulling force up to a first level and whereby said releasable engagement is released when subjected to a pulling force above a second level.

An air filter front end plate (1) configured to close off a front end (102) of a hollow air filter media pack (101), the front end plate comprises a bowl part (2) and a flange part (3) located along a periphery (4) of the bowl part (2), said bowl part including a connection point (5) located at the centre of the bowl part and being configured to be connected to a front end (132) of a mounting stand (131) in an air filter arrangement, the bowl part (2) extending from a forward end (21) toward a rearward end (22) of the air filter front end plate and is configured to be at least partially inserted into a front end opening (102) of the hollow air filter media pack (101), and wherein the bowl part (2) has a recurved shape with a first curved portion (7) located closer to said forward end (21) and a second curved portion (8) located closer to said rearward end (22), wherein said first curved portion (7) has a convex shape in relation to a centre line through the air filter front end plate and said second curved portion (8) has a concave shape in relation to said centre line, whereby the connection point (5) is located in a position forward of the second curved portion (8). The disclosure further relates to a pressure indicator washer, a pressure indicator assembly, a front end plate, an air filter cartridge (110) and an air filter arrangement (200).

An air filter front end plate (1) configured to close off a front end (102) of a hollow air filter media pack (101), the front end plate comprises a bowl part (2) and a flange part (3) located along a periphery (4) of the bowl part (2), said bowl part including a connection point (5) located at the centre of the bowl part and being configured to be connected to a front end (132) of a mounting stand (131) in an air filter arrangement, the bowl part (2) extending from a forward end (21) toward a rearward end (22) of the air filter front end plate and is configured to be at least partially inserted into a front end opening (102) of the hollow air filter media pack (101), and wherein the bowl part (2) has a recurved shape with a first curved portion (7) located closer to said forward end (21) and a second curved portion (8) located closer to said rearward end (22), wherein said first curved portion (7) has a convex shape in relation to a centre line through the air filter front end plate and said second curved portion (8) has a concave shape in relation to said centre line, whereby the connection point (5) is located in a position forward of the second curved portion (8). The disclosure further relates to a pressure indicator washer, a pressure indicator assembly, a front end plate, an air filter cartridge (110) and an air filter arrangement (200).

An air purifier includes an interior volume divided into upper and lower chambers, with a motorized fan assembly being positioned within the upper chamber. An ultraviolet (UV) light source is positioned within the lower chamber. A lower fan shroud includes concentric annular ribs that extend axially into the lower chamber and terminate in respective flared distal ends. The flared distal ends deflect light from the UV light source to reduce leakage of the light into the upper chamber. A diffuser can surrounds the UV light source, is affixed to the fan shroud, and has angled louvers deflecting the light to further reduce leakage thereof. Embodiments include a cylindrical media basket surrounding the diffuser can and having a media material disposed therein or thereon. The louvers are oriented to direct the light from the UV light source toward the media material.

An air purifier includes an interior volume divided into upper and lower chambers, with a motorized fan assembly being positioned within the upper chamber. An ultraviolet (UV) light source is positioned within the lower chamber. A lower fan shroud includes concentric annular ribs that extend axially into the lower chamber and terminate in respective flared distal ends. The flared distal ends deflect light from the UV light source to reduce leakage of the light into the upper chamber. A diffuser can surrounds the UV light source, is affixed to the fan shroud, and has angled louvers deflecting the light to further reduce leakage thereof. Embodiments include a cylindrical media basket surrounding the diffuser can and having a media material disposed therein or thereon. The louvers are oriented to direct the light from the UV light source toward the media material.