I recently contacted with Ductzilla Fairfax to clean out my air duct vents and a dryer. Two guys came out, James is the person that I dealt with. Very professional, he explained everything he would be cleaning and taking apart. They actually clean vents and go through each duct, clean return vents and grills. I actually had minor mold in both units which needed treatment. Of course, it was extra but overall very satisfied with work. They replaced filters I provided. Definitely worth it. Now we know we are breathing cleaner mold free air. Highly recommend this company!!!