The short answer – no, it shouldn’t be. Our duct cleanings consist of sealing each individual supply and return grille throughout the house. Then air-washing each line one at a time back to a commercial-grade, HEPA vacuum installed near the air handler or furnace. Finally sweeping the entire supply and return trunks to make certain all dirt and debris have been removed from the system. In a basic duct system, this process can easily take an entire day.