Patent ID: 6716266
Filing Date: 2004-04-06
Classification: B01D,Y10S

Abstract:
A dust filter for a ducted air delivery system comprising,a frame defining an open mouth, the frame having a body portion formed of rubbery thermoplastics material reinforced with one or more stiffening elements, a filter material extending from the-sides of the frame to cover the open mouth, an intermediate extension of rubbery thermoplastic material extending outwardly from a join with the body portion, and an integral lip of flexible resilient material joined to the intermediate extension at a location outwardly displaced from the join with the body portion the integral lip extending outwardly from the body portion in a different direction to the intermediate extension so that it makes an angle with the intermediate extension, the integral lip being less than half the thickness of the body portion over at least half of its extent, wherein the lip of flexible resilient material is shaped so that it may make a friction fit within the outlet of a duct to hold the dust filter therein, and upper and lower layers of the rubbery thermoplastic material extend above and below the one or more stiffening elements to form a four layer composite comprising the under and lower layers of rubbery thermoplastics material, the stiffening elements and a peripheral edge of the filter material.