This air duct was thoroughly cleaned utilizing a system that includes roto-scraping, a push-pull air delivery and collection system, and a HEPA filtration system. This ensures all visible dust is removed, and 99.97% of particles are removed. Keeping the HVAC and ductwork system clean may not only drastically improve air quality indoors, but also help extend the life span of equipment by allowing it to operate at peak condition, which may save you money in the long run.