Hepa Replacement FilterFor Allergen Reducer Models CAS1000/2000, 1100/2100.Advanced 2-stage filter contains pleated commercial grade high efficiency HEPA filter* and activated carbon filter, utlizes same HEPA filter material used in hospital operating rooms and commercial clean rooms. Tested and rated in compliance with AHAM certification standards. capturing small particles down to.1 micron for maximum air cleaning efficiency. Purchase two replacement filters for allergen reducer models CAS1000 and 2100. Dimensions 6.85 x 3.54 x 5.59.