Atlas Architectural Metals drywall interior system is an interior door frame and glazing system designed to fit over conventional drywall construction. The system is assembled into rough openings left in the drywall and attached to the wall.  The Drywall Interior System fits over two common drywall throat sizes.  The wall thicknesses are 3-3/4” for our 375 series and 4-7/8” for our 487 series.