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Circle 105 on inquiry card This whole-house HEPA filter packaged system easily installs on the return air side of a forced-air system. It comes complete with a high-efficiency pre-filter, a true HEPA cell and a blower/motor assembly. The cell can remove 99.97% of particulate at 0.3 microns in the airstream. A five-year warranty is offered on all electrical parts. Enerzone. Circle 106 on inquiry card The Drain-Rooter PH drain cleaning machine features a power cable feed and variable speed motor. The unit can be operated in both horizontal and vertical positions to get closer to the drain opening. Drum speed can be varied by changing pressure on a foot pedal, making it easier to thread the boring head through strainers and crossbars. Users can vary the feed rate from 0 ft./min, to 16 ft./min. The unit weighs 22 lb. General Wire Spring. ED-W is a line of wide-pitch retractable ducting hat features stitched construction. It can be fabricated in sizes up to 36-in. for moving large volumes of air under positive pressure. The ducting can be fabricated from a wide variety of materials such as vinyl-coated polyester, silicone-coated fiberglass and metallized fabrics. Heat-resistant threads enable the ducts to handle temperatures up to 1,000 [degrees] F. Hi-Tech Hose.

The operation of an EAF is a batch process in which steel scrap, pig iron, a source of iron oxide such as roll scale or iron ore, and limestone or burnt lime are charged into the furnace. The roof is closed over the furnace and electrodes are lowered until arcs are established between them and the metallic charge. The heat generated by the arc and the heat developed from the resistance to the flow of current in the metal melts the charge. When the heat (meaning the metal in the furnace) is finished, the furnace is tilted and poured into a tap ladle through a tap hole or spout in the furnace side wall. After each heat, repairs to the bottom and slag line are made by shoveling in a refractory bottom patching material.

For flux-cored-arc welding, shops use CV or CC types, 300 to 1,500 A, 25 to 50 V, rated 60- to 100-percent-duty cycle. CV types are more popular because wire-feed speed, set before welding, controls welding current. Cc types require a variable-speed or voltage-sensing wire feeder.Gas-tungsten-arc welding (GTAW) requires a constant-current (AC or DC) power supply with a steep volt-amp curve to minimize current change for variation in voltage or arc length. They come rated to 1,500 A, 10 to 75 V, at 40- to 100-percent-duty cycle. Most GTAW power supplies come equipped with high-frequency circuitry for arc initiation and stabilization, gas valves, and cooling-water valves for high-current welding. High-frequency arc start is useful when the maximum open-circuit voltage allowed by NEMA standards, 80 to 100 V, will not establish and maintain a stable arc.