The frame of the air filter used in this aircraft is made of aluminum alloy profiles, and the interior is made of high-efficiency glass fiber material pleated. The overall weight is higher than 20 kg. Compared with the filter material of melt-blown material, this type of aviation high-efficiency filter has a more stable efficiency and will not decay quickly. Passenger-carrying aircraft need to be equipped with high-efficiency air filters. The filtration efficiency for 0.3 micron particles can reach more than 99.9%. The size can be customized according to requirements.

Two filter spec sheets sit on the same desk. One is marked "HEPA, 99.97% at 0.3 microns." The other...
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