Abstract: A fluid heat exchanger comprising an exterior duct and an interior duct extending longitudinally and centrally through said exterior duct, each duct having an entry end port and exit end port. The interior duct comprises a lower wall, an upper wall and two opposed sidewalls extending generally perpendicularly therebetween, and a partition having exposed corrugated surfaces centrally disposed between and extending generally parallel to the sidewalls. The corrugations of the exposed surfaces extend generally transversely of the interior duct. The exterior duct has a lower wall, an upper wall, and two opposed sidewalls extending generally perpendicularly therebetween. The sidewalls of the exterior duct extend generally parallel to the sidewalls of the interior duct and have inwardly facing corrugated surfaces. The corrugations of the sidewalls extend generally transversely of the exterior duct.

Abstract: A hood for capturing fumes and dust generated during operating of a metal melting furnace including an integral conveyor for charging the furnace. The furnace has an upwardly opening mouth covered by a lid. The hood overlies the lid to capture fumes and dust emanating from the furnace during melting, slagging, pouring, and associated furnace operations. An opening is provided in the hood for insertion of material, e.g., scrap metal, into the furnace. The instant invention includes a conveyor flexibly, e.g., pivotally, mounted between the hood and the lid. The hood opening includes a hopper mounted above the conveyor and opening through the hood into the conveyor. The illustrated system further includes an opening through the furnace lid and a chute adjacent the furnace lid opening for engaging a distal end of the conveyor when the conveyor is moved into a use position. A door is provided to close the distal end of the conveyor when the conveyor is not moving material into the furnace.

Abstract: A multi-position duct system includes a generally horizontally extending first duct section having one wall defined by a flexible web. The first duct section has first and second ends and is pivotally mounted adjacent its first end for movement in a horizontal arc about a support member. A car is mounted on the first duct section for longitudinal movement. The car engages the flexible web to define within the car a chamber in open communication with the interior of the first duct section. A second telescoping duct section having vertically upper and lower ends is attached at its upper end to the car and moves therewith longitudinally of the first duct section. The second duct section also is in open communication with the chamber. A hood for collecting air containing pollutant fumes and particles is attached to the lower end of the second duct section. The first duct section is attached to a source of suction.

Abstract: An exhaust system for use with an electric arc melting furnace having a crucible and an upwardly directed mouth covered by a roof, and a device coupled to the roof for projecting it upwardly along an axis and pivotally about the axis to a position out of registry with the mouth for providing access for charging the furnace, and a device for tilting the furnace for tapping and slagging. In one embodiment the fumes exhaust system comprises an exhaust fan, a telescoping main fumes exhaust duct flexibly coupled at one end to the exhaust fan, a coupler flexibly connected to the other end of the main fumes exhaust duct and a tapping and melting manifold and hood flexibly and telescopically connected to the coupler. The tapping and melting manifold and hood are connected to the roof and project vertically along the roof axis and pivot about the roof axis with the roof to a position out of registry with the mouth. A slagging manifold and hood are mounted on the furnace and connected to the coupler.

Abstract: For use with an electric arc melting furnace having a crucible and an upwardly directed mouth covered by a roof, and a device coupled to the roof for projecting it upwardly along an axis and pivotally about the axis to a position out of registry with the mouth for providing access for charging the furnace, and a device for tilting the furnace for tapping and slagging, a fumes exhaust system comprising an exhaust fan, a telescoping main fumes exhaust duct flexibly coupled at one end to the exhaust fan, a coupler flexibly connected to the other end of the main fumes exhaust duct and a tapping and melting manifold and hood flexibly and telescopically connected to the coupler. The tapping and melting manifold and hood are connected to the roof and project vertically along the roof axis and pivot about the roof axis with the roof to a position out of registry with the mouth. A slagging manifold and hood are mounted on the furnace and connected to the coupler.

Abstract: In a combination of a furnace which is provided with an upwardly opening mouth, a lid for the mouth, a hood associated with the furnace and enclosing the mouth, the hood having a ceiling disposed above the uppermost position of the lid and the ceiling being formed with a port registering with the furnace mouth, and a cover for the port, the improvement in which the lid is supported upon a generally vertically upwardly extending post for swinging movement with the post about a substantially vertical axis outside the boundary of the mouth between a position in registry with the mouth and a position laterally removed from such registry, and the cover being mounted upon the post for swinging movement about the axis with the post and the lid.