CPC B01D 46/06 (2013.01) [B01D 29/11 (2013.01); B01D 39/2003 (2013.01); B01D 39/2017 (2013.01); B01D 46/0005 (2013.01); B01D 2239/0681 (2013.01); B01D 2275/10 (2013.01)] | 19 Claims |
1. A fiberglass product comprising:
a first fiber curl layer on an upstream air entry side of the fiberglass product, the first fiber curl layer having a plurality of fiber curl first fibers and a constant first density;
a fiberglass backing layer on a downstream air exit side of the fiberglass product opposite the air entry side of the fiberglass product, wherein the fiberglass backing layer includes a plurality of third fibers and a constant third density; and
a second fiber curl layer between the first fiber curl layer and the fiberglass backing layer, wherein the second fiber curl layer includes a plurality of fiber curl second fibers and a constant second density, wherein the second density is larger than the first density, and wherein the third density is larger than the second density.
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