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Report (104) 4/10/18 I DUCT WORK REPLACEMENT ? ''' 1. REMOVE OLD DUCTWORK Remove old fiber duct for supply. Remove and relocate return duct. A. Install new i. Install new r-8 insulated flex duct for the supply of rtu-3. ii. Mount supply boxes in framing for ceiling supply. iii. After Sheetrock complete install decorative supply grille. iv. Install 16"return duct in new location. v. Reuse original return box and grille.