x0000x00002 Briefing paperCabin air qualityIATA Corporate Communications January 2018Q2 Are all commercial aircraft fitted with HEPA filters The majority of modern large commercial aircraft ID: 847622
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��1 Briefing paperBriefing paperCabin ir uality Risk of communicable diseases transmission ��2 Briefing paperCabin air qualityIATA Corporate Communications January 2018Q2: Are all commercial aircraft fitted with HEPA filters? The majority of modern, large, commercial aircraft, which use a recirculation type of cabin air system, utilise HEPA filters. A small number of older aircraft types have filters with lower efficiencies. Q3: What is the smallest particle size that the cabin air filter element can remove? Air filters can remove very small particles such as bacteria and viruses. Virtually all viruses and bacteria are removed; even the most difficult particles in the range of 0.1 to 0.3 micron are filtered out with an efficiency level of of 99.995%. Contrary to popular belief, very small particles below 0.1 micron are easily filtered out by the mechanism of diffusional interception. Q4: How often are filters changed? The i
2 nterval varies by aircraft. Most airline
nterval varies by aircraft. Most airlines replace cabin air filters at regular "hard time" intervals to fit in with routine scheduled maintenance periods, as long as these intervals do not exceed filter manufacturers’ recommendations. Q5: What happens if the cabin air filter elements are not changed out regularly? Air flow through the filter might be reduced, but the efficiency of the filter at capturing viruses and bacteria is not affected. Q6: Is there a danger to the maintenance personnel by removing used cabin air filters? There is no more risk involved in replacing a cabin air filterthan carrying out general maintenance on any aircraft part that has been in service for a number of years. Working with WHO, IATA has published guidance material for maintenance staff which is available at http://www.iata.org/whatwedo/safety/health/Pages/diseases.aspx. * This briefing paper was assembled from information provided by Airbus, Boeing and Pall Corporate.