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On most planes the air exchange rate is approximately every three minutes and 75 comes from outside the plane meaning that only 25 of cabin air is recirculated. All recirculated air is passed through these filters before re-entering the cabin or b. How Hepa Filters Have Been Purifying Cabin Air Since The 1990s News Tal Aviation Usually there are two per plane. Airplane air filtration system . Air supply is essentially sterile and particle-free says IATA. Find incredible deals at BEST-PRICE. All of our aircraft are equipped with hospital-grade HEPA air filters. Cabin air is completely changed every three. Most airliners recycle 25-30 of the air in the cabin. You can see them along the ceilings and walls of the aircraft. These filtration systems then filter and recirculate the air from the cabin and mix it with fresh air. According to the Environmental Protection Agency HEPA filters catch at least 9997 percent of dust pollen mold bacteria and any airborne particles ...