Russell B. Bleakley Plumbing & Heating, Inc.

Heating Question and Answers

Forced Hot Air

For forced hot-air heat, metal ducts are used to carry the air to in-room registers. A blower or fan is used to push the air through the ducts to its destination. This fan cycles on and off with the furnace and is responsible for keeping the hot air from backing up into the system. Timed to cycle off shortly after the burner shuts down, the timing of the fan is what keeps cold air from being pushed through the system, as well. Equally important to the production of hot air heat is the return air supply that is used to fuel the system. It is essential that the amount of air space dedicated to the supply (hot) and return (cold) air be the same in a forced air system.

Forced air heat is always immediate, arriving with a burst to heat the air in the room that calls for it. Forced hot air travels along trunks and branches to reach its destination. When the burner fires, the fan distributes the hot air to open pathways and registers. Dampers placed along the trunk at branch locations prevent the hot air from entering certain zones when they are closed.

 

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