Abstract: A thermally actuated deflector structure for automatically varying the air discharge pattern of a ceiling diffuser in response to a sensed change in the temperature of air being delivered to the diffuser includes a multi-bladed damper assembly positioned over a central outlet portion of the diffuser and having a frame portion secured to the diffuser. The blades in the damper assembly are drivable between a cooling orientation in which they block the central diffuser portion and preclude supply air flow downwardly therethrough, and a heating orientation in which they uncover the central diffuser portion and permit supply air flow downwardly therethrough. A coiled bimetallic actuating strip is positioned above the damper assembly and has an inner end anchored to the damper frame, and an outer end secured to a drive member linked to the damper blades.

Abstract: The adjustable pipe fitting of the invention has double walls in accordance with Type B standards established by the American National Standards Institute and Underwriters Laboratories. In the preferred embodiment, the invention comprises a main conduit having three sections which are rotatably coupled together. A branch conduit is securely connected to the main conduit so that fluid communication exists between the branch and main conduits. The branch conduit also comprises three sections which are rotatably coupled together. The main conduit sections and the branch sections are coupled together at oblique angles relative to their respective longitudinal axes to provide a means for adjusting the fitting to accommodate connector pipes having various angles and orientations.

Abstract: An inexpensive and easily maintained gas burner assembly achieves the manufacturing and maintenance advantages of the conventional sand pan burner design in addition to the heat output and fuel efficiency of more complex burner designs. The invention comprises a tray having a bottom wall and sidewalls defining an interior and an open top. A cover channel having a midsection segment and at least two downwardly depending flanges is adapted to fit in the interior of the tray to form a mixing chamber between the cover channel and the tray. The downwardly depending flanges are spaced away from the sidewalls of the tray to form gaps suitable for filling with a noncombustible granular substance, such as sand or crushed pumice stone. The cover channel additionally comprises at least one projection extending above the top segment and defining at least one burner port. The projection is preferably a longitudinal ridge defining a plurality of burner ports.