How must air transported to occupied spaces be treated if produced from rock or dust-producing materials?

When air is transported to occupied spaces and it is produced from rock or dust-producing materials, filtering is essential to ensure that any particulates or contaminants are removed from the air. This treatment is critical for maintaining indoor air quality and ensuring that the environment is safe and comfortable for occupants.

Rock and dust-producing materials can generate significant amounts of dust and other particles that can affect respiratory health and overall comfort. By filtering the air, mechanical systems can capture these particles before the air reaches occupied spaces, thus preventing them from being inhaled by occupants and reducing the risk of allergens and irritants.

While other treatments like chilling or heating can affect air temperature and comfort levels or evaporating may be considered in different contexts, they do not address the issue of air cleanliness in the same effective way that filtering does. Therefore, filtering the air is the necessary approach to ensure that it is safe for people to breathe.