What is the primary function of an All-Air System?

What is the primary function of an All-Air System?

• A. To condition space via centrally produced conditioned air.
• B. To provide only ventilation without conditioning.
• C. To humidify only.
• D. To remove all air from the space.

Answer: (A)

An all-air system conditions the space by delivering centrally produced conditioned air through a ducted network. The central air handler cools or heats the air (and often controls humidity and filtration), and this conditioned air is distributed to the occupied spaces. Outdoor air is brought in to meet ventilation requirements and mixed with return air as needed to maintain proper temperature, humidity, and IAQ. The primary function is to use centrally conditioned air to both condition and ventilate the space, rather than merely providing ventilation without conditioning, humidifying only, or removing all air from the space.

An all-air system conditions the space by delivering centrally produced conditioned air through a ducted network. The central air handler cools or heats the air (and often controls humidity and filtration), and this conditioned air is distributed to the occupied spaces. Outdoor air is brought in to meet ventilation requirements and mixed with return air as needed to maintain proper temperature, humidity, and IAQ. The primary function is to use centrally conditioned air to both condition and ventilate the space, rather than merely providing ventilation without conditioning, humidifying only, or removing all air from the space.