Why must air transported through rock or dust-producing materials be filtered?

Filtering air transported through rock or dust-producing materials is essential primarily for maintaining air quality. When air moves through such materials, it can pick up and carry fine particles, dust, and other contaminants that can compromise the overall air quality within a building or system. Poor air quality can lead to health issues for occupants, as inhaling dust and particulate matter can cause respiratory problems and other health implications.

By implementing proper filtration, these harmful substances can be significantly reduced, ensuring that the air remains clean and safe for breathing. This practice is especially crucial in environments where sensitive equipment is in use or where individuals may have existing health conditions.

Other options might touch on relevant aspects, but the primary focus in air filtration through these materials must prioritize health and safety, making air quality the most significant reason for the requirement.