Hart&Cooley. install confidence SUBMITTER DRAWING «ALL STEEL CONSTRUCTION «DAMPER CONTROLS AIR EVENLY OVER ENTIRE DIFFUSE *FINISH: GOLDEN SAND (GS) ENAMEL FINISH DAMPER MOUNTING HOLES .19 DIA, 3 HOLES DIFFUSE MOUNTING HOLES L111 DIA, 3 HOLES EVENLY SPACED .031 C.R. STEEL .043 C.R. STEEL .025 C.R.