Abstract: An exhaust flue cap and filter device for a gas fired appliance in communication with an exhaust flue opening. The device includes an inner collar to engage the exhaust flue opening. A tubular cap with a closed lower end is in communication with the inner collar. A filter tray is suspended in the tubular cap wherein the filter tray has a smaller diameter than the tubular cap so that a bypass space is formed between the filter tray and the tubular cap to permit passage of exhaust gases. A removable filter insert is receivable in the filter tray. A removable top having a body with exhaust openings is attached to and closes the open upper end of the tubular cap.

Abstract: A multi-purpose chimney cap device for a flue opening. The device includes a tubular housing with an open lower end surrounding the flue opening and an open upper end. A plurality of ventilation openings in the lower portion of the tubular housing draws air into the tubular housing. A plurality of exit openings are provided near the open upper end of the tubular housing. A removable heat deflector is attached to the open upper end of the tubular housing. A removable non-metal weather shield is fastened to the heat deflector to provide an enclosed chamber between the weather shield and the heat deflector. A receiver/transmitter within the enclosed chamber resides between the weather shield and the heat deflector.

Abstract: A cap for a flue opening of a chimney in order to enhance draw of smoke and in order to protect from entry of animals and debris. The device includes sidewalls fabricated from flat sheet metal and a top attached to the sidewalls from fasteners. A plurality of louver openings are provided in the sidewalls in order to draw air. A plurality of exit vent openings in the sidewalls above the louver openings are at least equal to a cross-sectional area of the flue opening. An inner frame and mounting assembly includes a mechanism to both anchor the device to the chimney flue and to level the device.