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Pleated carbon panel filters in standard HVAC 1″, 2″, and 4″ depths — drop-in replacements for existing filter slots, with activated carbon impregnation for odor and VOC adsorption. The full Koch OdorKleen family lives here: ES (MERV 8 basic), 250 CarbonWeb (MERV 8 high carbon load), 600 CarbonWeb (MERV 10 with KMnO4 alumina), and 200/M13 (MERV 13 fine particulate + carbon).