HA COOLEY SUBMITTER DRAWING * ALL STEEL CONSTRUCTION * DIFFUSES MADE IN LISTED SIZES INCH * AVAILABLE IN 3 INCH INCREMENTS * OPTIONAL FIELD MOUNTED CONTROL GRID: MODEL SR6 * OPTIONAL FIELD MOUNTED DAMPER: SPECIFY AS SR7 * FINISH: WHITE (W) ENAMEL DIFFUSE WITH OPTIONAL CONTROL GRID & 0.B.