For Large Size Rooms 17' x 22' #1 Choice of Physicians*. Of physicians surveyed who recommend portable room air cleaners to their patients who suffer from allergies or asthma due to air pollution: 93% consider HEPA filtration to be extremely or very effective. 82% prescribe or recommend Honeywell or enviracare® portable room air cleaners. True HEPA Filtration helps reduce common household allergens, including: - Pollen - Household Dust - Tobacco Smoke Particles - Cat Dander - Mold Spores Advanced Filtration True HEPA Filter - High Efficiency Particulate Air (HEPA) filter helps capture some airborne particles and allergens that pass through it. - SurroundSeal™ HEPA filter technology helps prevent unfiltered air from leaking around HEPA filter. - Large filter area for long filter life and low maintenance - Replace every 1 - 3 years, depending on use Activated Carbon Pre-Filter - Helps reduce some household odors. - Helps capture large particles, protecting the HEPA filter life. - Replace every 3 months, depending on use. Advanced Air Flow System - Ultra quiet high speed operation for maximum performance. - Patented air cleaner technology releases filtered air upwards into the room where you breathe it. Intelli-Check™ Electronic Filter Change Indicators - Reminds you to check or replace pre-filter and HEPA filter. Replacement Filters: HEPA Filter - Model 24000 Activated Carbon Pre-filter - Model 38002 5-Year Limited Warranty - Note: Replaceable HEPA filter and Carbon Pre-filter are not covered by this warranty AHAM Certified Clean Air Delivery Rate ~ Certified Rating From air cleaner to air cleaner, compare the CADR number. First, look at suggested room size. Then refer to the tobacco smoke, dust and pollen Clean Air Delivery Rate (CADR) numbers. The higher the numbers, the faster the unit filters the air. This air cleaner is suggested for use in a single closed room up to 390 square feet. Room size ratings conform to the AHAM Certification Program criteria of 80% smoke reduction. Higher Clean Air Delivery Rates provide improved performance in all room sizes. Portable air cleaners will be much more effective in rooms where all doors and windows are closed. - Tobacco Smoke: 250 - Dust: 250 - Pollen: 250 These values represent performance that can be expected within the first 72 hours of operation. Subsequent performance may vary with use. Proud Supporter of American Lung Association® - Partners in Air Quality Education Honeywell and the American Lung Association® are partners in the national program to educate the public about the hazards of poor indoor air quality and ways to protect their lung health. The enclosed information is from the ALA and is part of our educational efforts.