Question: A low-velocity residential air duct is to be equipped with a manufacturer's heating module. It is expected that the module will temper dry air by heating it from 40?F to 80?F. Hot water from a boiler package is available. Due to inefficiencies in the boiler, the exit water temperatures will range from 140?F to 180?F. Select a manufacturer's heating module to heat the air and prepare an equipment schedule for the client's contract documents. The air duct size will depend on the size of the module unit that is selected by the mechanical engineer.