AIR FILTER MATERIAL, FILTER PACK, AND AIR FILTER UNIT

摘要

Provided are an air filter material, filter pack, and air filter unit, which are capable of having an extended service life even when being formed of a material that can be embossed. The air filter material (1) has a tensile elongation of not less than 10%. A main collection layer (30) has a filling rate of 5-15% and a thickness of 0.35-0.70 mm, wherein there is a peak within each of the range of less than 1.0 μm and the range of not less than 1.0 μm in a fiber diameter distribution, the average fiber diameter of small fiber diameters of less than 1.0 μm is not less than 0.1 μm but less than 0.8 μm, the average fiber diameter of large fiber diameters of not less than 1.0 μm is not less than 1.2 μm but less than 3.0 μm, and the volume ratio of fibers having small fiber diameters to fibers having large fiber diameters is 30:70 to 80:20.