What must the air transported to occupied spaces through rock or dust-producing materials be?

The requirement that air transported to occupied spaces through rock or dust-producing materials must be filtered is essential for ensuring indoor air quality and protecting the health of occupants. Rock or dust-producing materials can generate particulate matter, which may contain harmful dust and pollutants that can be detrimental to respiratory health. By filtering the air, the system removes these particulates, preventing them from being circulated into occupied spaces.

Filtering the air helps to capture dust, allergens, and other contaminants, thus providing a cleaner and safer environment for occupants. This is particularly critical in spaces where vulnerable individuals, such as those with respiratory conditions, may be present. Maintaining air quality standards through filtration is a key aspect of mechanical systems in buildings, ensuring compliance with health and safety regulations.