Gas Fitter Practice Test

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What is the normal return air requirements for forced air furnaces?

700
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1000

The correct answer is: 900

For forced air furnaces, the normal return air requirement is typically set at about 900 cubic feet per minute (CFM) per ton of cooling capacity. This standard ensures efficient furnace operation and adequate airflow for heating the space effectively. It is vital to maintain proper return airflow as it allows the system to circulate air properly, thus preventing overheating and ensuring even distribution of heat throughout the area being serviced. Factors such as the size of the space, the furnace's efficiency rating, and the insulation levels can influence the exact return air requirements, but 900 CFM serves as a baseline for most residential systems. This standardization contributes to optimal performance and energy efficiency in heating applications.