When placing 2 * 4” dim. flanged elbows having a flange thickness of 3 inches, Bolts still have the default spec bolt length, 3 1/2”. When placing 2 * 4” dim. flanged elbows having a flange thickness of 3 inches but with a 0.5” spacer between the 2 elbows, Bolts is calculated and have the total bolt length, 8 1/2”. SH
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