QUICK-ACTING LOW-PROFILE RAMPED SCUTTLES > IAW DWG: 803-5184144 > NOTE: STANDARD CLEAR OPENING DIAMETER IS 21" (ALTERNATE SIZES AVAILABLE) > SPECIFY WHEN ORDERING: ANY SPECIAL INSTRUCTIONS > MATERIAL: STEEL (ALTERNATE MATERIALS AVAILABLE) > STANDARD FINISH: INORGANIC ZINC AND FORMULA 150 PRIMER; FLAME (WIRE) SPRAYED ALUMINUM AVAILABLE FOR EXTERIOR SCUTTLES