A method of filtering particulates from the air comprising the steps of: a. providing an air filtering device in a room, wherein said device comprises a fan; and an air filter substrate comprising: a first component layer comprising: a mixture of fibers comprising shaped fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from 0.7 dpf to 7.0 dpf; a plurality of hollow protrusions and recessed regions, wherein said hollow protrusions comprise a protruded length from 3mm to 16 mm and a non-protruded length from 2 mm to 14 mm and a protruded height from 0.5 mm to 3 mm, and wherein said hollow protrusions and recessed regions comprise a planar area ratio from 40:60 to 60:40; and a second component layer comprising at least 50% of fibers having a denier from 0.9 dpf to 2.0; a plurality of connections connecting said first component layer and said second component layer; and b. activating said fan to move 70 CFM (1.9 m 3 /min) to 150 CFM (4.3 m 3 /min) of air to said air filter, at 15 to 25 Pa of pressure, preferably 70 CFM (1.9 m 3 /min) to 100 CFM (2.8 m 3 /min) of air to said filter and the pressure drop of air through said air filter is less than 20 Pa. a. providing an air filtering device in a room, wherein said device comprises a fan; and an air filter substrate comprising: a first component layer comprising: a mixture of fibers comprising shaped fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from 0.7 dpf to 7.0 dpf; a plurality of hollow protrusions and recessed regions, wherein said hollow protrusions comprise a protruded length from 3mm to 16 mm and a non-protruded length from 2 mm to 14 mm and a protruded height from 0.5 mm to 3 mm, and wherein said hollow protrusions and recessed regions comprise a planar area ratio from 40:60 to 60:40; and a second component layer comprising at least 50% of fibers having a denier from 0.9 dpf to 2.0; a plurality of connections connecting said first component layer and said second component layer; and a fan; and an air filter substrate comprising: a first component layer comprising: a mixture of fibers comprising shaped fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from 0.7 dpf to 7.0 dpf; a plurality of hollow protrusions and recessed regions, wherein said hollow protrusions comprise a protruded length from 3mm to 16 mm and a non-protruded length from 2 mm to 14 mm and a protruded height from 0.5 mm to 3 mm, and wherein said hollow protrusions and recessed regions comprise a planar area ratio from 40:60 to 60:40; and a second component layer comprising at least 50% of fibers having a denier from 0.9 dpf to 2.0; a plurality of connections connecting said first component layer and said second component layer; and a first component layer comprising: a mixture of fibers comprising shaped fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from 0.7 dpf to 7.0 dpf; a plurality of hollow protrusions and recessed regions, wherein said hollow protrusions comprise a protruded length from 3mm to 16 mm and a non-protruded length from 2 mm to 14 mm and a protruded height from 0.5 mm to 3 mm, and wherein said hollow protrusions and recessed regions comprise a planar area ratio from 40:60 to 60:40; and a mixture of fibers comprising shaped fibers having at least two different deniers, wherein each fiber in said mixture comprises a denier from 0.7 dpf to 7.0 dpf; a plurality of hollow protrusions and recessed regions, wherein said hollow protrusions comprise a protruded length from 3mm to 16 mm and a non-protruded length from 2 mm to 14 mm and a protruded height from 0.5 mm to 3 mm, and wherein said hollow protrusions and recessed regions comprise a planar area ratio from 40:60 to 60:40; and a second component layer comprising at least 50% of fibers having a denier from 0.9 dpf to 2.0; a plurality of connections connecting said first component layer and said second component layer; and b. activating said fan to move 70 CFM (1.9 m 3 /min) to 150 CFM (4.3 m 3 /min) of air to said air filter, at 15 to 25 Pa of pressure, preferably 70 CFM (1.9 m 3 /min) to 100 CFM (2.8 m 3 /min) of air to said filter and the pressure drop of air through said air filter is less than 20 Pa.