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About Northern ToolNorthern Tool & Equipment Company is a multi-channel supplier of high quality products to do-it-yourselfers and businesses including automotive shops, grounds maintenance professionals, contractors and others for over 22 years. With 43 stores in 10 states and a strong Web presence, Northern is the ultimate resource for generators, small engines, pressure washers, hand, air and power tools, hydraulics, pumps, trailer parts, seasonal equipment, automotive supplies, NorTrac tractors, and much more. Visit the company on the Web at www.northerntool.com.

The use of permanent magnets instead of rotor windings makes the motor smaller and lighter than induction motors. Using magnetic-bearing technology, a 75-ton compressor weighs 265 lb--about one-fifth the weight of a conventional compressor.A variable-speed drive (VSD) is required for the motor to operate. The VSD varies the frequency between 300 and 800 Hz, which provides a compressor-speed range from 18,000 to 48,000 rpm. This avoids a gear set. The VSD is integrated into the compressor housing, avoiding long leads and allowing key electronic components to be refrigerant-cooled. The VSD also acts as a soft starter; as a result, the compressor has an extremely low startup in-rush current: less than 2 amps, compared with 500 to 600 amps for a traditional 75-ton, 460-v screw compressor with a cross-the-line starter.

Circle 108 on inquiry card This duct liner offers a high level acoustic and thermal resistance. It meets thermal performance requirements lawnmowerelectricclutch of many of the most stringent local and state energy codes, including Title 24 of the California Building Standards Code. An encapsulant edge coating covers fibers and prevents flaring of the insulation at the edges (an important IAQ concern with internal duct linings). The airstream surface is treated with an anti-microbial agent to prevent the growth of fungi and bacteria. Knauf. Circle 109 on inquiry card The Wind Guard air curtain is a fixed-speed, belt-driven unit that produces large volumes of air at low operating sound pressure levels. Primary applications are over doors 14-ft. to 26-ft. in height. It can successfully repel gusts of wind up to 30 mph. Heated and unheated models are available, with heated models available in gas, electric, steam and hot water coil designs. Mars Air Doors.