Patent ID: 8083574
Filing Date: 2011-12-27
Classification: B01D,F23G,F23J,F23L

Abstract:
1. An exhaust flue cap and filter device for exhaust from a gas fired appliance in communication with an exhaust flue opening having an outer pipe and a coaxial liner, which device comprises: a tubular cap with an open lower end for admission of atmospheric gases, an opposed open upper end, and a plurality of ventilation holes, said cap receivable over said exhaust flue opening; a filter tray suspended in said tubular cap by a series of stand-offs, wherein said tray has a smaller diameter than an inner diameter of said tubular cap and a ledge extending radially inward from said tray; a bypass space formed around said filter tray between said filter tray and said inner diameter of said tubular cap to permit passage of both exhaust gases and atmospheric air; a removable top attached to and closing said open upper end of said tubular cap; a removable filter insert receivable in said filter tray within said tubular cap supported on said ledge, said filter insert arranged to permit axial flow through said filter insert; and an inner collar to engage said exhaust flue opening outer pipe.