How many CFM of outdoor ventilation are recommended for a 500 ft² conference room?

To determine the appropriate CFM (Cubic Feet per Minute) of outdoor ventilation for a 500 ft² conference room, standards for indoor air quality are typically referenced, such as those provided by organizations like ASHRAE (American Society of Heating, Refrigerating and Air-Conditioning Engineers). For conference rooms and similar spaces, a common recommendation is to provide around 10 CFM per person, depending on factors like expected occupancy and usage.

If we assume a typical occupancy of about 2 people per 100 ft² in meeting spaces, a 500 ft² room could accommodate around 10 people. Therefore, using the guideline of 10 CFM per person:

10 people × 10 CFM/person = 100 CFM

However, considering the factors such as reducing air change rates for comfort or special circumstances that could result from different room usage scenarios, 50 CFM serves as a reasonable baseline for smaller gatherings or less intense usage. This recommendation balances the need for adequate fresh air while considering efficiency and comfort for gatherings that may not fully utilize maximum occupancy at all times.

Thus, 50 CFM is a commonly accepted figure for maintaining a comfortable and healthy indoor environment in a moderately sized conference setting.