Where a, b and c are the inside dimensions and d x is the wall thickness
2/ d x (a b + b c + c a) + 4 (0.64) (a + b +c) + 8 (0.45) d x
2/ d x (a b + b c + c a) + 4 (0.44) (a + b +c) + 8 (0.35) d x
2/ d x (a b + b c + c a) + 4 (0.34) (a + b +c) + 8 (0.25) d x
2/ d x (a b + b c + c a) + 4 (0.54) (a + b +c) + 8 (0.15) d x
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Q. The shape factor for complete rectangular furnace is Where a, b and c are the inside dimensions and d x is the wall thickness
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