What type of air enables the balancing of return air and outside air?

Relief air refers to the air that is removed from a space to maintain pressure balance within a building's HVAC system. This type of air plays a crucial role in balancing return air and outside air, as it serves to equalize pressure differences created when outside air is introduced into a condition space. By allowing for the controlled exit of air, relief air helps to manage the overall airflow and ensures that the right amount of fresh air enters while preventing pressure build-up or loss.

In this context, understanding the role of relief air in maintaining a balanced air system is key. It complements the incoming fresh air, contributing to an efficient and comfortable environment while supporting airflow dynamics. Air-handling systems need to precisely control the mixture of return air and outside air to adhere to building codes and ensure optimal operational efficiency.