![]() ![]() It consists of British guitarist and vocalist Graham Russell (born Graham Cyril Russell, 11 June 1950, Sherwood, Nottingham, England, UK) and Australian lead vocalist Russell Hitchcock (born Russell Charles Hitchcock, 15 June 1949, Melbourne, Victoria, Australia). You chose the design method and enter the input data ( Air flow CFM, Friction loss or velocity, Duct depth) and on the right hand side you get the output data (Duct diameter for round duct or duct width for rectangular duct). Air Supply is a soft rock duo who had a succession of hits worldwide through the late 1970s and early 1980s. It is used for sizing supply and return duct systems using the equal friction or equal velocity design methods.
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