DUCT CLEANING PKG-1 (2-system) : 12 Supply's and 1 Return, Remove and Clean all Supply vents and Return grills. Contact clean Ducts with Roto brush machine. Includes Antimicrobial Fog* (Save $139) *Rusted/Over painted vent and/or have bacterial growth are not guaranteed. Also, any vents with caulking around them are Homeowners responsibility of re-caulking.