Content Container This unique product features a raised ceiling radiation damper mounted on an extended support frame above the ceiling line. It will accomodate any type of return air grille, filter grille or register manufactured from steel or aluminum. This allows the design engineer greater flexibility. Models 4127 - Raised Ceiling Damper (grille by others) • 12"x12" (300x300) 4128 - Raised Ceiling Damper (grille by others) • 24"x12" (600x300) 4129 - Raised Ceiling Damper (grille by others) • 24"x24" (600x600) Submittals All Submittals Combined Individual Submittals 4127, 4128, 4129 • Raised Type for Optional Grille & Register 4127, 4128, 4129 • Raised Type for Optional Grille & Register • w/ Adjustable Volume Control - AV IOM 4111 - 4119 & 4121 - 4129 • Fire Rated Ductless Return Air Ceiling Damper & Grilles Catalog