a.)ducting (rectangular & round)supply & installation b.)insulation, c.)canvas connection d.)machine mouth connection e.)machine replacement f.)machine hanging g.)rag (return air grill) supply & installation h.)sad (supply air damper) supply & installation i.)vcd (velocity control damper) supply & installation j.)smoke duct with exhaust) supply & installation k.)plenum box supply & installation l.)linier supply & installation m.)fixable duct supply & installation n.)sound box supply & installation