| 摘要 |
Retainers which facilitate the use of a supplementary filter medium, such as activated carbon for removing odors, as well as supplementary filters, in combination with conventional air particulate filter elements in an existing HVAC system, without modification to the HVAC system. Retainers and supplementary filters include a frame-like planar flange having outer edges defining a rectangle sized to match the rectangular air particulate filter element, and are assembled in a sandwich-like configuration with the air particulate filter element. The sandwich-like configuration has rectangular dimensions substantially identical to that of the air particulate filter element, but an increased thickness. However, it is the combined thickness of the air particulate filter element and the planar flange only of the retainer or supplementary filter which is required to be accommodated by a filter mount, and not the entire thickness of the supplementary filter medium.
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