Abstract: Linear sections (101) of a chimney assembly (100) each include concentric outer, intermediate and inner sleeves (102, 104, 106). The inner sleeve (106) is interconnected at its lower portion (140) to the intermediate sleeve (104) through spaced apart U-shaped clips (142), while the upper portion of the inner sleeve (106) is allowed to float. The inner sleeve (106) is thus spaced apart from the intermediate sleeve (104) with an insulative air gap (136) therebetween. The air gap (136) and the particular connective arrangement of the inner sleeve (106) to the intermediate sleeve (104) allows for both linear and radial thermal expansion of the inner sleeve (106) caused by high temperature waste flue gases, and also facilitates engagement of adjoining linear sections (101).

Abstract: A thermally operated vent damper wherein a flue pipe (12) mounts an eliptical damper plate (38) for rotation about a hollow rod (30). A slot (42) is formed in the damper plate (38) by bending a flange (44) perpendicular to the plane of the damper plate (38) and providing an opening for a coil (52) of bimetallic material. The coil (52) controls the movement of the damper plate between closed and opened positions responsive to temperature in the flue pipe (12). An opening (19) in the flue pipe adjacent to the coil (52) provides a means for maintaining the coil (52) temperature lower than the flue gas temperature and for controlling the opening of the damper plate in the flue pipe in inverse proportion to the draft therein. A second bimetallic coil (60) is mounted outside the flue pipe to relieve stresses on the first bimetallic coil during prolonged high temperature excursions within the flue pipe.

Abstract: An air register for distributing air to a room has a thermally responsive actuator element in direct contact with a pivotably mounted closure slat for controlling the flow of air through the register. The air is distributed upwardly along the wall of a room and a venturi, mounted in the air flow path, draws air in through an opening in the front of the register and over the actuator so that the actuator senses room temperature of the treated air passing through the register. The slats which control the flow of air through the register are biased in an open position and the actuator tends to close the slats through a direct linear force on the slats.

Abstract: An air diffuser embodying a housing, defining an air chamber, adapted to be mounted in a suitable opening in a wall or ceiling of a room, and having an air inlet in one side thereof adapted to be connected to an air duct, or the like, and an air outlet on the opposite side thereof, with a substantially flat air deflector unit extending across the air outlet and defining the outer face of the air diffuser remote from the air inlet, and deflector unit having a plurality of adjustable modules having openings constituted and arranged therein in such a manner as to cause air discharged from the outlet to flow laterally away from the diffuser along the wall or ceiling in which the diffuser is mounted.