1. I.C. engine
  2. Air preheaters
  3. Heating of building in winter
  4. None of the above
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Answer: Option 4

IC Engine- Forced Convection Air Preheaters- Air preheaters use the hot exhaust gas from the furnace to heat the incoming combustion air Heating of building in winter-Conduction is heat traveling through a solid material. On hot days, heat is conducted into your home through the roof, walls, and windows.

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