Patent ID: 8485153

Claim:
An air induction passageway for an internal combustion engine comprising; an air intake duct, said air intake duct having an inlet end and an outlet end and a passageway defined by a side wall extending between said inlet end and outlet end, said air intake duct including an opening formed in a portion of said wall, a flange formed on the outer surface of said air intake duct surrounds said opening, said flange being directed radially outward from the wall of said air intake duct and a grid having an outer perimeter frame that conforms to an inner perimeter formed by said flange; said air induction passageway further including an acoustic membrane mounted within said opening, said acoustic membrane is sized to fit within said flange and fit within said opening; said acoustic membrane being formed from a woven material wherein the woven material of said acoustic membrane has a weight within the range of 25 to 85 g/m 2 a pore size that falls within the range of 38um to 18um and a thickness that falls within the range of 40um to 125um, said woven material being positioned between said grid and said outer surface of said air intake duct, whereby said acoustic membrane reduces inlet noise by dissipating pressure waves in the air intake duct.