Gas Fitter Practice Test

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What is the minimum supply air in CFM per ton of cooling required for a domestic air conditioner?

The correct answer is: 400

The minimum supply air requirement for a domestic air conditioner is typically considered to be 400 CFM (cubic feet per minute) per ton of cooling capacity. This standard ensures that enough air is circulated to effectively dissipate heat and maintain comfortable indoor temperatures while also achieving proper humidity control and air quality. When an air conditioning system operates, it draws in warm air from the indoor space, cools it and then circulates it back to the room. If the airflow is insufficient (below 400 CFM per ton), the system may struggle to cool effectively, leading to longer run times, increased wear and tear on the equipment, and potentially higher energy costs. The 400 CFM guideline is based on ensuring a balanced system for adequate cooling and air distribution, promoting efficient operation while enhancing comfort levels for occupants. This standard is essential for HVAC professionals to understand when designing and evaluating systems in residential settings.