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(1.5 CEU) Gas furnaces come in a variety of designs and sizes, with efficiencies that range from 50% to more than 90%. This lesson covers the three main furnace types and the factors that most affect their efficiency. You’ll learn the following.

  • How to detect signs of incomplete combustion.
  • How to diagnose common gas-combustion problems.
  • How blowers, filters, and ducts affect forced-air system efficiency.