Duct cleaning is smart! Energy efficient homes and offices have closed environments that can easily become more polluted than outside air. Dust, contaminents and airborne bacteria recirculating through soiled furnace and AC ducts are the prime causes. Customers shuld know that these ducts must be cleaned annually to ensure a health home environment. Effective The Cleanco IAQ Cleaning System we use has a unique dual action process that simultaneously brushes and vacuums, providing an advantage over other systems which simply blow air into the ducts. The result is minimap clean-up, no dust clouds with no filters or ongoing equipment replacement. The scouring action of four flexible nylon whippers dislodges pollutants for removal by the vacuum.