Within the supply air definition, only the outdoor air component of the supply airflow may be counted as replacement air. Which statement best reflects this?

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Multiple Choice

Within the supply air definition, only the outdoor air component of the supply airflow may be counted as replacement air. Which statement best reflects this?

Explanation:
Replacement air is the outdoor air portion of the supply that actually replaces air exhausted from the space. The supply flow can include outdoor air and recirculated air, but only the outdoor component introduces fresh air from outside to make up for what leaves the space. Recirculated air is conditioned internal air being reused and does not count as replacement air. So the outdoor air portion is the only part that can be counted as replacement air. For example, if total supply is 600 CFM with 150 CFM outdoor air and 450 CFM recirculated, the replacement air is 150 CFM.

Replacement air is the outdoor air portion of the supply that actually replaces air exhausted from the space. The supply flow can include outdoor air and recirculated air, but only the outdoor component introduces fresh air from outside to make up for what leaves the space. Recirculated air is conditioned internal air being reused and does not count as replacement air. So the outdoor air portion is the only part that can be counted as replacement air. For example, if total supply is 600 CFM with 150 CFM outdoor air and 450 CFM recirculated, the replacement air is 150 CFM.

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