Actual Filter Size: 17-3/4 x 23-34 x 3/4 inches. Trust: We provide the best for you. We Provide Filtration for: nuclear contamination; space programs; pharmaceutical laboratories. 90 days effective protection against these common household contaminants. Pollen. Dust. Dust mite. Pet dander. Mold. Bacteria. Virus carriers. Odor. Foremost in air filtration. Last up to 90 days. Merv 8 Ashrae Rating 52.2-2007 Get to Know Your Filter: Who is Flanders Filters? Founded in 1950, we are the largest and most diverse manufacturer of filtration products in the industry, providing the most types and sizes of air filters available. In addition to filters for your home use, we also manufacture commercial, industrial, and high purity filters and air filtration equipment to service a customer base consisting of the top companies in the industrial, semiconductor, pharmaceutical, biotechnology, and nuclear markets, as well as the space programs. This focus on air filtration allows us to maintain and invest in air filtration only, as opposed to diluting research funds into developing products unrelated to air filtration. So when we say trust, we provide the best for you - it's not just a motto, it's a statement you can believe in. How Does Flanders Test their filters? Our filters are tested at independent air filter testing facilities that are members of the National Air Filtration Association (NAFA). These test facilities utilize a true and proven scientific method for air filter testing created by the American Society of heating, refrigeration, and air conditioning engineers, ASHRAE 52.2 -2007. Some filter manufacturers use their own rating system, which is not approved as an industry standard. What is a merv rating? Minimum efficiency reporting value, or MERV for short, is a filter rating system devised by Ashrae, the american society of heating, refrigeration, and air conditioning engineers, to standardized and simplify air filter efficiency ratings for the public. The higher the MERV rating, the higher the effectiveness of the air filter. Simply stated, a MERV 13 filter wll remove larger amounts of small particles from the air than a MERV 8 filter. MERV ratings allow you to effectively compare one type or brand of filter to another. For example, the EPA guidance for indoor air quality in schools recommends filters between MERV 8 and MERV 13. By comparison, the typical fiberglass throwaway filter used in most homes has a rating of MERV 4 or less. If allergies or asthma are your concern, we suggest you choose a MERV 8 filter at a minimum. About the naturalaire odor eliminator w/ baking soda. Flanders NaturalAire odor eliminator w/ Baking Soda is a pleated filter with the addition of a sodium bicarbonate that maintains a healthy pH balance. This natural, non-toxic additive helps trap contaminants and eliminates food, pet, and human odors rather than cover them up. Each fiber within the filter is coated with baking soda giving them a fuzzy covering. This fuzziness enhances odor removal and increases the contact area for dust to be captured by the filter. With a MERV 8 rating, the Flanders Natural/Aire Odor eliminator w/ baking soda not only offers superior odor filtration, it also provides protection against many other common household contaminants such as dust mites and those that aggravate allergies like pet dander and pollen. To ensure the best possible quality for your home and family, it is important to change your filters as recommended. Beyond recommended change interval (All graphics are for representational purposes only. Does not apply to actual performance). Recommended change interval (All graphics are for representational purposes only. Does not apply to actual performance). New filter (All graphics are for representational purposes only. Does not apply to actual performance). Greater filter surface area for longer life and better energy efficiency. The more filter area you have, the better the ability to trap dirt, pollen and other particles. NaturalAire pleated filter design provides more filtration surface area. It's like having more than one filter. Did you know? Baking soda is also known as sodium bicarbonate, bicarbonate of soda, sodium hydrogen carbonate, and nahcolite. Baking soda is both a naturally occurring material, present in most organic life forms and produced artificially. Baking soda has disinfectant and antiseptic properties and can be an effective fungicide against some organisms. Baking soda is able to react as both an acid and a base. Merv: Minimum Efficiency Reporting Values (Ashrae Standard 52-2): Group 1: Merv Rating: Merv 1: Avg Efficiency 3.0 - 10.0 microns: Less than 20%. Merv 2: Avg Efficiency 3.0 - 10.0 microns: Less than 20%. Merv 3: Avg Efficiency 3.0 - 10.0 microns: Less than 20%. Merv 4: Avg Efficiency 3.0 - 10.0 microns: Less than 20%. Group 2: Avg Efficiency 3.0 - 10.0 microns: 20% - 34.9%. Merv 6: Avg Efficiency 3.0 - 10.0 microns: 35% - 49.95%. Merv 7: Avg Efficiency 3.0 - 10.0 microns: 50 - 69.9%. Merv 8: Avg Efficiency 3.0 - 10.0 microns: 70% - 84.9%. Group 3: Merv Rating: Merv 9: Avg Efficiency 1.0-3.0 microns: Less than 50%; Avg Efficiency 3.0 - 10.0 microns: Greater than or equal 85%. Merv 10: Avg Efficiency 1.0-3.0 microns: 50% - 64.9%; Avg Efficiency 3.0 - 10.0 microns: Greater than or equal 85%. Merv 11: Avg Efficiency 1.0-3.0 microns: 65% - 79.9%; Avg Efficiency 3.0 - 10.0 microns: Greater than or equal 85%. Merv 12: Avg Efficiency 1.0-3.0 microns: 80% - 89.9%; Avg Efficiency 3.0 - 10.0 microns: Greater than or equal 90%. Group 4: Merv Rating: Merv 13: Avg Efficiency 0.3 -1.0 microns: Less than 75%; Avg Efficiency 1.0-3.0 microns: Greater than or equal 90%. Flat panel furnace filter. Pleated. Mean Particles (Microns): 20: 28 percent (by weight); 0.005 percent (by particle count). 7.5: 52 percent (by weight); 0.175 percent (by particle count). 4.0: 11 percent (by weight); 0.25 percent (by particle count). 2.0: 6 percent (by weight); 1.07 percent (by particle count). 0.5: 3 percent (by weight); 98.5 percent (by particle count). 1 microns = approx 1/125,400 in. Grain of salt (100 microns). Human hair (80 microns). Debris and other particles visible to the naked eye (approx 25 microns). Heavy atmospheric dusts, spores and asbestos (approx. 10 microns). Mold pollen and avg atmospheric dust (approx 5-10 microns). Bacteria and light atmospheric dust (approx 1.5 microns). Tobacco smoke, bacteria, metal dusts and paint pigments (approx .3 - 1 microns). Classified UL listed. Air filter unit as to flammability only 542L. www.flanderscorp.com. flandersfilters.com.