Saw Uses CV or CC Power Supplies,... 200 to 1,500 A, 28 to 44 V, at 60- to 100-percent-duty cycle. Automatic units commonly use up to 1,500 A on one wire. Cv welding machines that offer variable-slope control give the welder extra adjustability, and can extend the usefulness of the machine to weld a range of material thicknesses and types.Selection of Power SourcesWhen choosing a power source, start by checking NEMA specs. NEMA Class I arc-welding power sources deliver rated output at 60-, 80-, or 100-percent-duty cycle: Class II units, 30-, 40-, or 50-percent; and Class III, 20 percent. First consider capacity and kind of current needed for the job. Rely on the manufacturer''s rating as being conservative: don''t buy more capacity than needed. Choose low--duty-cycle machines only for maintenance or for intermittent welding. If portability is important, consider inverter units.

Are you looking for something to replace contaminated fiberglass liners in air handlers and ductwork that won''t just become contaminated again? Then consider the benefits of Engineered Polymer Foam Insulation from Nomaco. It has an efficient thermal resistance, resists the growth of bacteria and mold, has zero water absorption, has no fibers, is nontoxic and is available in sheets from 3/8-in. to 1-in. thickness.The Lifebreath Air Cleaner from Nutech Energy Systems uses a bank of standard throw-away filters. And, no, the air doesn''t flow through the filters, it flows between them. Return air running lengthwise down the face of a bank of filters supposedly results in "near HEPA cleaned air," according to the manufacturer.

Due to their larger pore size, primary or first filters create less restriction to the low vacuum created by the diaphragm pump. The canister base may have a clear window to see water in the fuel and a drain cock in the bottom of the housing to drain the water. Remember, if you find excessive sludge in the primary filter, the engine may be running over-loaded or have an overheating problem since carbon is developing from fuel burning in the injector nozzle.Secondary filters that follow the transfer pump have smaller pore sizes to filter the finer dirt and carbon particles. They also may have a water drain or service drain hole.

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