What is permitted in corridors as a source of makeup air for exhaust systems in specific rooms?

Using outdoor air as a source of makeup air for exhaust systems in specific rooms is essential to maintain a balanced and healthy indoor environment. Outdoor air helps to replenish the oxygen used in various activities and dilutes any contaminants that may be present due to exhaust processes. This approach is particularly important in spaces like bathrooms or kitchens, where high levels of moisture and odors can be generated, affecting overall indoor air quality.

Ventilation requirements often mandate the introduction of fresh air to counteract the negative impacts of exhaust systems. Guidelines within the North Carolina Mechanical Code typically emphasize the necessity of outdoor air to ensure that adequate fresh air is provided, which can prevent issues like negative pressure in the structure and promote occupant comfort and safety.

While indoor air, recycled air, and heated air may be considered in other contexts, they do not fulfill the requirement as effectively as outdoor air does for the purpose of providing makeup air for exhaust systems. Indoor air might not offer the same quality or freshness needed, recycled air can carry pollutants back into the space, and heated air does not guarantee proper ventilation or air quality standards set by code. Thus, the use of outdoor air aligns best with the principles of effective ventilation and indoor air management.