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A filter assembly including a rectangular inlet frame having a rectangular inlet opening, a rectangular outlet frame, a housing body being collapsible to have a flattened shipping state and an erect state, the collapsible housing body in the erect state being rectangular and interposed between the r

A filter assembly including a rectangular inlet frame having a rectangular inlet opening, a rectangular outlet frame, a housing body being collapsible to have a flattened shipping state and an erect state, the collapsible housing body in the erect state being rectangular and interposed between the rectangular inlet frame and the rectangular outlet frame in an assembled state, and at least one filter having filter media installed in the rectangular inlet opening in generally sealing relation thereto and projecting from the inlet frame toward the outlet frame in the assembled state.

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1. A filter assembly, comprising: a rectangular inlet frame having a seating surface in surrounding relation of a rectangular inlet opening;a rectangular outlet frame;a housing body being collapsible to have a flattened shipping state and an erect state, the collapsible housing body in the erect sta

1. A filter assembly, comprising: a rectangular inlet frame having a seating surface in surrounding relation of a rectangular inlet opening;a rectangular outlet frame;a housing body being collapsible to have a flattened shipping state and an erect state, the collapsible housing body in the erect state being rectangular and interposed between the rectangular inlet frame and the rectangular outlet frame in an assembled state;at least one filter having filter media installed in the rectangular inlet opening in generally sealing relation thereto and projecting from the inlet frame toward the outlet frame in the assembled state;wherein the at least one filter includes an outer peripheral flange seated against the seating surface;wherein the rectangular inlet frame defines a rectangular recess having the seating surface in surrounding relation of the rectangular inlet opening, wherein the at least one filter includes a primary filter comprising: at least one of a V-bank filter and a rectangular filter that includes filter media that is at least 3 inches deep, and a prefilter upstream of the primary filter and seated against an upstream face of the outer peripheral flange;a first rectangular gasket interposed between the outer peripheral flange of the primary filter and the sea surface forming a seal therebetween; andcompression clips mounted on an outwardly facing side of the rectangular inlet frame, the clips engaging the prefilter to retain the prefilter; and at least two clips compressing the primary filter and the first rectangular gasket against the seating surface. 2. The filter assembly of claim 1, wherein the clips are rotatable relative to the inlet frame to have a compression portion that moves over the rectangular recess for causing compression, when the clips can be rotated such that the clips are clear of the rectangular recess to allow removal of the primary filter and the prefilter. 3. A filter assembly, comprising: a rectangular inlet frame having a seating surface in surrounding relation of a rectangular inlet opening;a rectangular outlet frame;a housing body being collapsible to have a flattened shipping state and an erect state, the collapsible housing body in the erect state being rectangular and interposed between the rectangular inlet frame and the rectangular outlet frame in an assembled state;at least one filter having filter media installed in the rectangular inlet opening in generally sealing relation thereto and projecting from the inlet frame toward the outlet frame in the assembled state;wherein the at least one filter includes an outer peripheral flange seated against the seating surface;first and second housing gaskets having a rectangular shape, the first housing gasket scaling between the rectangular outlet frame and the housing body, the second housing gasket sealing between the rectangular inlet frame and the housing body; anda plurality of snap fasteners securing the housing body to each of the rectangular outlet frame and the rectangular inlet frame to maintain the first and second housing gaskets in a state of compression. 4. The filter assembly of claim 3, wherein the snap fasteners comprise buttons attached to the housing body and project outwardly therefrom, each of the rectangular outlet and inlet frames having a rectangular L-shaped bracket portion with a seating recess receiving the first and second housing gaskets, respectively, with the housing body installed inside outer walls of the rectangular outlet and inlet frames, the outer walls having mounting holes through which the buttons project to fasten in snapped relation. 5. The filter assembly of claim 3, wherein the rectangular outlet frame has a solid panel facing the inlet opening, the solid panel having an opening customized and matched to a corresponding air flow opening of a building. 6. The filter assembly of claim 3, wherein the rectangular outlet frame and the rectangular inlet frame are molded of material comprising plastic; and wherein the housing body comprises corrugated wall board comprising plastic material, the corrugated wall board having integral hinges formed therein to provide for folding flat and for assembly into a configuration for interposition between rectangular inlet and outlet frames, the inlet frame further including a grid-work to provide at least two of said rectangular inlet openings for separate filter elements to be installed into each rectangular inlet opening. 7. The filter assembly of claim 3, wherein the filter assembly is installed in an animal confinement building, the primary filter having a filter media rated to filter PRRSV from air flow into the building, and wherein the prefilter filters dust to prevent premature plugging of the primary filter. 8. The filter assembly of claim 3, wherein the rectangular inlet frame defines a rectangular recess having a seating surface in surrounding relation of the rectangular inlet opening, wherein the at least one filter includes a single-header box filter having an outer peripheral flange seated against the seating surface, and further includes a prefilter upstream of the single-header box filter, the prefilter seated against an upstream face of the outer peripheral flange. 9. A filter assembly, comprising: an inlet frame having an inlet opening;an outlet frame;a housing body extending between the inlet frame and the outlet frame;first and second housing gaskets, the first housing gasket sealing between the outlet frame and the housing body, the second housing gasket sealing between the inlet frame and the housing body;at least one filter having filter media, the filter installed in the inlet opening in generally sealing relation thereto, the filter projecting from the inlet frame toward the outlet frame in the assembled state;wherein the inlet frame and the outlet me are rectangular, wherein the rectangular inlet frame defines a rectangular recess having a seating surface in surrounding relation to the inlet opening;wherein the at least one filter hides ai er peripheral flange seated against the seating surface;wherein the at least one filter includes a primary filter comprising at least one of a V-bank filter and a rectangular filter that includes filter media that is at least 3 inches deep;a prefilter upstream of the primary filter and seated against an upstream face of the outer peripheral flange;a first rectangular gasket interposed between the outer peripheral flange of the primary filter and the seating surface forming a seal therebetween; andcompression clips mounted on an outwardly facing side of the inlet frame, the clips engaging the prefilter to retain the prefilter; and at least two clips compressing the primary filter and the first rectangular gasket against the seating surface. 10. The filter assembly of claim 9, wherein the clips are rotatable relative to the inlet frame to have a compression portion that moves over the rectangular recess for causing compression, wherein the clips can be rotated such that the clips are clear of the rectangular recess to allow removal of the primary filter and the prefilter. 11. A filter assembly, comprising: an inlet frame having an inlet opening;an outlet frame;a housing body extending between the inlet frame and the outlet frame;first and second housing gaskets, the first housing gasket sealing between the outlet frame and the housing body, the second housing gasket sealing between the inlet frame and the housing body;at least one filter having filter media the filter installed in the inlet opening in generally sealing relation thereto, the filter projecting from the inlet frame toward the outlet frame in the assembled state;wherein the inlet frame and the outlet frame are rectangular, wherein the rectangular inlet frame defines a rectangular recess having a seating surface in surrounding relation to the inlet opening;wherein the at least one filter includes an outer peripheral flange seated against the seating surfacea plurality of snap fasteners securing the housing body to each of the outlet frame and the inlet frame to maintain the first and second housing gaskets in a state of compression. 12. The filter assembly of claim 11, wherein the at least one filter includes a primary filter comprising at least one of a V-bank filter and a rectangular filter that includes filter media that is at least 3 inches deep, and a prefilter upstream of the primary filter and seated against an upstream face of the outer peripheral flange. 13. The filter assembly of claim 12, comprising a first rectangular gasket interposed between the outer peripheral flange of the primary filter and the seating surface forming a seal therebetween. 14. The filter assembly of claim 13, further comprising a second rectangular gasket interposed between the upstream face of the outer peripheral flange and the prefilter. 15. The filter assembly of claim 11, wherein the snap fasteners comprise buttons attached to the housing body and project outwardly therefrom, each of the outlet and inlet frames having an L-shaped bracket portion with a seating recess receiving the first and second housing gaskets, respectively, with the housing body installed inside outer walls of outlet and inlet frames, the outer walls having mounting holes through which the buttons project to fasten in snapped relation. 16. The filter assembly of claim 15, wherein the outlet frame has a solid panel facing the inlet opening, the solid panel having an opening customized and matched to a corresponding air flow opening of a building. 17. The filter assembly of claim 16, wherein the outlet frame and the inlet frame are molded of material comprising plastic; and wherein the housing body comprises corrugated wall board comprising plastic material, the corrugated wall board having integral hinges formed therein to provide for folding flat and for assembly into a rectangular configuration, the inlet frame further including a grid-work to provide at least two of said inlet openings for separate filter elements to be installed into each inlet opening. 18. The filter assembly of claim 11, wherein the filter assembly is installed in an animal confinement building, the primary filter having a filter media rated to filter PRRSV from air flow into the building and wherein the prefilter filters dust to prevent premature plugging of the primary filter.