3 x 10 )= 45 July 8, 2019 16 32 64 128 2x 3 x 10 )= 45 3 10 x 450 3 1 4 x 10 45 degree duct elbow 7 3 x 4 )- 10 =- 45 3 45 x 10 bằng bao nhiêu 3 45 x 10 20 5 5x 3 10 x )+ x 45 3 1 4 x 10 flat 45 wall stack 1 2 x 3 8 x 10 45 4500 x 10 3 3 1 4 x 10 inch flat 45 elbow 456 x 10 3 45.1 x 10 3