3M5 - Type-B Gas Vent Round Pipe - 3" X 60"Metal Fab 3M5 Type B Gas Vent Round Pipe 3" X 60" Material Specifications The outer wall is constructed of galvanized steel, . 018" thick G 90 for sizes 3" to 14" diameter, and . 024" thick G 90 for sizes 16" to 30" diameter. The inner wall is constructed of aluminum alloy, . 012" thick for sizes 3" to 8" diameter and . 018" thick for sizes 10" to 30" diameter. The vent includes an integral, annular insulating air space, " thick for sizes3" to 6"
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