How many CFM of transfer air is required for a single-family bedroom with intermittent use?

For a single-family bedroom with intermittent use, the requirement for transfer air is often based on ensuring proper ventilation and air quality. A value of 50 CFM is considered a standard recommendation for this type of space when the room is used intermittently, such as sleeping or occasional activities.

This CFM level is adequate to provide sufficient fresh air, while also allowing for the exchange of indoor air to ensure contaminants, such as CO2 and other pollutants from occupants, are adequately diluted and ventilated. The calculated amount helps maintain comfort and health while considering energy efficiency, avoiding excessive air movement that could contribute to discomfort or increased heating/cooling loads.

When evaluating the other options, lower values like 30 CFM may not provide adequate ventilation for the space, especially if it is used intermittently, potentially leading to poor indoor air quality. Conversely, choosing much higher values like 70 or 100 CFM may be excessive for a bedroom, leading to unnecessary energy expenditure or discomfort from drafts. Hence, the 50 CFM figure strikes an essential balance for proper air transfer in a bedroom setting, particularly for intermittent use.