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Do you design the mechanical wall behind the washer dryer with a 2x4 stud size or a 2x6? Due to the size of the rigid Snaplock 4" vent pipe and the necessity in some regions to provide a 4" plumbing vent stack, it is advisable and common in many parts of the US to build that wall behind the washer and dryer with a 2x6 stud wall. The outside dimensions of both the metal exhaust Snaplock pipe or the plumbing stack are in excess of the limited 3 1/2" space a 2x4 provides.