The Honeywell Odor Reducing Carbon Type "A" Pre-filter helps deodorize the air and traps larger particles such as dust, lint, fibers, and pet fur. Helps reduce odors and maximize HEPA filter life. Recommended replacement period: every 3 months. Contains 1 filter that can be cut to size to fit Honeywell True HEPA Air Purifier models. Works with all Honeywell True HEPA Air Purifiers including: 10500 series, 10590 series, 11150 series, 12500 series, 13300 series, 13503, 13520 series, 13530 series, 14500 series, 17000 series, 18100 series, 40000 series, 50100 series, 50150 series, 50200 series, 50250 series, 50300 series, HPA090, 100, 200, and 300 series, HA100, HA200, and HA300 series models.