What is the relationship between makeup air and exhaust air in a commercial kitchen?

In a commercial kitchen, the relationship between makeup air and exhaust air is critical for maintaining proper air balance and ensuring good indoor air quality. Makeup air refers to the fresh air that is drawn into the kitchen to replace the air that is being exhausted. This air circulation is vital for several reasons, including preventing negative pressure, ensuring adequate combustion for cooking appliances, and avoiding air quality issues.

When the makeup air is approximately equal to the exhaust air, it helps maintain a balanced system where the air being removed is effectively replaced with fresh air. This balance reduces the likelihood of backdrafts from other appliances, like water heaters or furnaces, which can occur if the kitchen is under negative pressure. Additionally, having an appropriate amount of makeup air ensures that there is enough oxygen for combustion and that any combustion-related pollution is adequately diluted and carried outside.

Therefore, it is essential for commercial kitchens to have makeup air that is roughly equal to the volume of air being exhausted. This relationship supports safety, operational efficiency, and comfort within the kitchen environment.