Which formula calculates outdoor airflow needed to achieve a target ACH in a space?

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Multiple Choice

Which formula calculates outdoor airflow needed to achieve a target ACH in a space?

Explanation:
The main idea is that ACH is how many times the space’s air is replaced in one hour. So the total volume of air that must move through the outdoor intake in an hour is ACH multiplied by the room’s volume. Therefore, outdoor airflow in cubic feet per hour equals ACH × room volume. If you need the rate in cubic feet per minute, you’d divide by 60 (CFM = (ACH × volume)/60). The other expressions either add a 60 factor (giving per-minute flow only) or misplace the conversion, so the straightforward ACH × room volume form matches the requested measure in hours as given.

The main idea is that ACH is how many times the space’s air is replaced in one hour. So the total volume of air that must move through the outdoor intake in an hour is ACH multiplied by the room’s volume. Therefore, outdoor airflow in cubic feet per hour equals ACH × room volume. If you need the rate in cubic feet per minute, you’d divide by 60 (CFM = (ACH × volume)/60). The other expressions either add a 60 factor (giving per-minute flow only) or misplace the conversion, so the straightforward ACH × room volume form matches the requested measure in hours as given.

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