What is the minimum intermittent exhaust that must be provided for a residential bathroom?

The minimum intermittent exhaust requirement for a residential bathroom is 50 CFM (cubic feet per minute). This standard is generally established by the guidelines provided in building codes and ventilation standards to ensure adequate air exchange and moisture control.

In a bathroom, proper ventilation is essential to remove excess humidity and prevent problems such as mold growth and deterioration of materials due to moisture accumulation. The 50 CFM rating is considered sufficient for most standard bathrooms to effectively remove moisture and odors during intermittent use, such as when a shower is in operation.

Higher CFM requirements may be appropriate for larger bathrooms or those with specialized needs, but for typical residential applications, 50 CFM meets the minimum criteria set forth for effective ventilation, aligning with building codes and best practices in HVAC design.