Patent ID: 8057566

Claim:
A final fiberglass product having at least one fiber curl layer, the final fiberglass product comprising: a fiber curl layer on an unfiltered air entry side, said fiber curl layer having a plurality of fiber curl fibers; a fiber skin layer on an air exit side opposite said air entry side, said fiber skin layer having a plurality of fiber skin fibers; a fiber loft layer between said fiber curl layer and said skin layer, said fiber loft layer having a plurality of fiber loft fibers; said fiber curl layer having a plurality of generally sinusoidal fiber bundles; wherein said fiber bundles have an average of three hundred to four hundred and fifty said fiber curl fibers therein; and wherein said fiber bundles have an average fiber bundle diameter of between seven tenths of a millimeter and one millimeter with a fiber bundle diameter standard deviation of less than sixth tenths of a millimeter.