The Challenge A major hospital in the St, Paul, MN area contacted TFS about a significant filter failure issue they were experiencing with several of their air handling units. The volume of air being moved was greater than the bank of air filters in place could accommodate, causing pleated prefilters to collapse and allow bypass to the final filters and reduce their life expectancy. The customer was struggling to keep a consistent schedule for changing filters, as they would replace them when they had already collapsed instead of when it was appropriate to keep the unit performing efficiently. Prefilters exist to capture larger particles and protect more efficient and costly final filters. When prefilters collapse and allow bypass of larger particulates, final filt

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