close-up of a dirty, dusty ventilation grille, showing signs of heavy contamination and neglect.

ventilation grille dust dirty contamination closeup neglect hvac maintenance pollution indoor health hygiene unclean buildup airquality rust texture detail interior filter debris environment repair grime particles system protection dirtyfilter dustcontrol airvent home sanitation air equipment decay rusty cleaning duct dustmites airflow industry ventilationduct old dustbuildup ai generated