According to the national Air Duct Cleaners Association (NADCA), the average six-room house collects 40 pounds of dirt, dust, and allergens in its air ducts each year. That's pretty gross. Air Express offers Tampa duct cleaning and replacement appointments to ensure that your indoor air quality is the best it can be. When dust accumulates in air ducts, mites do too. Approximately 40,000 dust mites can thrive in only one ounce of dust. These "dust bunnies" contain a host of unhealthy bacteria, fungi, and mold, which can be extremely detrimental to the health of you and your family.