Can UV lamps shining on the inlet face of a HEPA filter kill all of the organisms trapped on the media?
This would be highly doubtful because the lamp can’t kill what it can’t “see”. HEPA filters are designed with very closely spaced pleats, with typical pack depths of anywhere from three to four inches up to 12 inches. It’s highly unlikely that a lamp or lamps shining on the inlet face of a HEPA filter would expose microorganisms trapped on the inlet surfaces of the pleated media pack much beyond the first half-inch to one inch of depth, especially for pleats that are farthest away from the lamp(s). As a result, effectiveness would likely be limited to only a small percentage of the media area.
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