There could be lbs . of Dust hiding as part of your air ducts. Buildup from day-to-day HVAC use, pet dander, new development or transforming, smoking cigarettes and h2o destruction can increase numerous Grime, dust and particles particles inside your ductwork. Received allergic reactions? Dust mites, allergens, pet dander, germs https://www.pestcontrolqatar.com/carpet-cleaning.php