DUCT CLEANING PKG-2 (1 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* Additional to this package is cleaning the Supply and Plenum Boxes. (Save $35) *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.