2opposite duct to p/n 124n387-7; o/a h 2.690 in.; o/a w 1.360 in.; o/a lg 5.000 in.; flange chamfer 45.0 deg; chamfer lg 0.450 in.; 2 flange holes 0.218 to 0.229 in. Dia, 3.880 in. C to c; 2 internal tabs w/holes 0.062 to 0.066 in. Dia; matl steel cres