Door Frame, Type ST, Steel, 84 In H, 36 In W/ OPENING WIDTH: 36.00 INCHES NOMINAL OPENING HEIGHT: 84.00 INCHES NOMINAL FIRE RESISTANCE RATING IN HOURS: 3.0 SPECIAL FEATURES: LEFT HAND; MORTISE TYPE; USE WITH NSN 5670-01-674-2656. DISTRIBUTOR LISTED AS RNCC/VC:3/2 BECAUSE OEM, CECO DOOR, DOES NOT HAVE AN ACTIVE CAGE CODE MATERIAL: STEEL SHAPE: RECTANGULAR