When dust, mould, and allergens accumulate with your air ducts, they circulate in the course of your home each time your system operates. The right cleaning solution removes these contaminants without the need of detrimental your ductwork or releasing particles again into your own home. Image: Tom Fenenga for Bob https://www.google.com/maps/d/edit?mid=1h5Aamvc1ONZdG38nA4GQGQ_Xxb9lBPQ&usp=sharing