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A sound attenuator, or duct silencer, sound trap, or muffler, is a noise control acoustical treatment of Heating Ventilating and Air-Conditioning (HVAC) ductwork designed to reduce transmission of noise through the ductwork, either from equipment into occupied spaces in a building, or between occupied spaces.
"Cool Air" is a short story by the American horror fiction writer H. P. Lovecraft, written in March 1926 and published in the March 1928 issue of Tales of Magic and Mystery. Plot [ edit ]
"Mr. Ruggerio's Neighborhood" is the 27th episode of the HBO original series The Sopranos and the first of the show's third season. It was written by David Chase and directed by Allen Coulter , and originally aired on March 4, 2001.
Kelvinator ad from 1920 Kelvinator refrigerator, c. 1926. The enterprise was established on September 18, 1914, in Detroit, Michigan, United States, by engineer Nathaniel B. Wales, who introduced his idea for a practical electric refrigeration unit for the home to Edmund Copeland and Arnold Goss.
These motors are sometimes called DC motors, sometimes EC motors and occasionally DC/EC motors. DC stands for direct current and EC stands for electronically commutated.. DC motors allow the speed of the fans within a fan coil unit to be controlled by means of a 0-10 Volt input control signal to the motor/s, the transformers and speed switches associated with AC fan coils are not required.
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