Air Duct Clean knows the importance of having your ducts cleaned. According to the Environmental Protection Agency (EPA), the average home accumulates about 40 pounds of dust per year. You may see this manifest in your home in a couple of ways: Having to dust more frequently than usual Notice unusual odors when you turn the HVAC system on There are visible dust build-ups on your vent grills Observe streaking or black marks around your vent grills Members of the household begin to suffer from allergies or respiratory issues within the confines of your home Clogged dryer vents are the second leading cause of residential fires in the United States.