What is the recommended CFM per person for outside air ventilation?

The recommended CFM (cubic feet per minute) for outside air ventilation is 15 CFM per person. This guideline is significant in ensuring adequate ventilation rates in spaces occupied by individuals. Adequate ventilation helps dilute indoor pollutants, controls indoor humidity, and provides occupants with a healthier and more comfortable environment.

15 CFM is often recognized as a balance between providing enough fresh air to meet health and comfort standards without incurring excessive energy costs associated with heating or cooling that incoming air. This figure is derived from various standards and guidelines, including those from organizations focused on indoor air quality and ventilation requirements.

Using a lower CFM could result in insufficient air exchange, leading to stale air and potential accumulation of indoor pollutants. Conversely, excessively high rates might lead to higher energy consumption without significant added benefits to indoor air quality. Therefore, 15 CFM serves as a well-established benchmark that suits the needs of typical indoor environments.