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Read our privacy policyDual exhaust assembly, 26 gauge galvanized steel, 4” O.D. x 6” O.D. x 4” O.D. One 4” unit connection at 45° angle to vertical stack, other 4” unit connection straight to 6” common/vertical stack. 6” vent connection is crimped for ease of vent hook-up. Two adjustable elbows included to ease installation. Heaters must share a common thermostat.