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I tried fitting a baffle of varying lengths to see if the there was a meaningful improvement in carbon filtering and determined for my usage there was not. It seems the size of the pellets allowed some air to bypass the carbon pile no matter the length of the baffle. I thought about omitting a portion of the holes in the upper portion of the plate separating the carbon chamber from the fan but that would have lessened the amount of air that would ultimately pass through the filter assembly. The HEPA filter is taking the majority of the harmful nano-particles out of the the air flow in any event and I cannot detect any noxious odor in the processed air even when printing ABS.