Performed duct cleaning and sanitizing on 1st floor basement system. Remove and vacuum clean all floor registers to remove dust & debris before cleaning w/ duct cleaning machine. Disconnect all flexible duct Clean and polish all grilles. Clean return ductwork, Cut access opening in main plenum of supply and return ductwork to clean main supply trunk line and return. Secure all connections with patch plate, screws and silver tape. Ran system and sanitize after cleaning. System is back for normal operation @ this time. View visual findings from this job here - https://visionshare.xoi.io/?id=XA-DE27-811B15AACB93490AB4D116D68DC47E5E Office to bill for service tomorrow @ the end of job