Hollow Metal Door, Type 3, 84 x 36 In/ CROSS-SECTIONAL SHAPE STYLE: 26 FLAT WIDTH: 36.0 INCHES NOMINAL PERIPHERAL SHAPE STYLE: 1 RECTANGLE, NO HOLES LENGTH: 84.0 INCHES NOMINAL BODY THICKNESS: 1.75 INCHES NOMINAL SECURING DEVICE TYPE: HINGE SPECIAL FEATURES: THERMAL INSULATION U-FACTOR: 0.41; MORTISE LOCK TYPE; WEIGHT: 94LBS; 16-GAUGE STEEL COLOR: GRAY MATERIAL: STEEL NONDEFINITIVE SPEC/STD DATA: UL 3-HOUR FIRE RATING RATING