When dust, mold, and allergens accumulate as part of your air ducts, they circulate in the course of your home each time your program runs. The best cleaning solution gets rid of these contaminants without damaging your ductwork or releasing particles back into your own home. Photo: Tom Fenenga for https://www.google.com/maps/d/edit?mid=1cflLlXS9CdqA8WpBKv_oLoqlXORPcL4&usp=sharing