Patent ID: 6626754
Filing Date: 2003-09-30
Classification: B01D,F24F,Y10S

Abstract:
An air duct system for conveying and filtering a stream of air, comprising:an air duct adapted to convey the stream of air, the air duct having a generally tubular shape and comprising a fabric wall; an inflatable filter having a generally conical shape when inflated and attached to the fabric wall such that substantially the entire stream of air that passes through the air duct also passes through the inflatable filter; a first zipper that couples the inflatable filter to the air duct; a second zipper that couples the inflatable filter to the air duct; and a removable collar attached to the inflatable filter and attached to the first zipper and the second zipper, wherein the air duct includes an upstream duct and a downstream duct with the removable collar interposed therebetween via the first zipper and the second zipper.