Commercial air filter assembly and filter assembly and filtration unit

A commercial air filtration unit comprising:

• a housing defining an inlet region and an outlet, said inlet region supporting a shelf along a portion of the perimeter of said inlet region;
• and
• a filter assembly comprising:
• a frame defining an upstream portion and a downstream portion, said upstream portion forming an upstream lip, and said upstream lip defining a trailing surface,
• a sorbent material filter selectively coupled to said downstream portion, and
• a primary particulate filter defining an inner face and an outer face, said primary particulate filter being coupled to said upstream portion such that said inner face is adjacent said sorbent material filter and said upstream lip projects upstream of said outer face, creating an unobstructed space between said trailing surface and said outer face;
• wherein said upstream lip is selectively coupled to said shelf.

A filter assembly for use with a commercial air filtration unit housing forming an inlet region and including a retaining shelf disposed along a perimeter of said inlet region, said filter assembly comprising:

• a frame defining an upstream portion and a downstream portion, said upstream portion forming an upstream lip, and said upstream lip defining a trailing surface;
• a sorbent material filter selectively coupled to said downstream portion;
• and
• a primary particulate filter defining an inner face and an outer face, said primary particulate filter coupled to said upstream portion;
• wherein said upstream lip is positioned to create an unobstructed space between said trailing surface and said outer face, further wherein said filter assembly is configured to be selectively moveable relative to said housing from an installed position in which said frame is assembled within said inlet region, to a partially released position in which said frame extends outwardly from said inlet region for subsequent disassembly from said housing, and further wherein said frame is configured to be supportable by said retaining shelf in said installed and partially released positions.

A filter comprising:

• a primary particulate filter;
• and
• a sorbent material filter;
• and
• a frame comprising;
• an upstream portion configured to maintain said primary particulate filter such that said upstream portion encompasses a perimeter of said primary particulate filter;
• and
• a downstream portion extending from said upstream portion, said downstream portion forming an open-end channel configured to selectively receive said sorbent material filter;
• and
• a downstream lip dividing said upstream portion and said downstream portion.