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2019-12-12 · a vertical vent or chimney. (This method cannot be used with GWS boilers.) Chimney draft venting cannot be used for GWS or GWS-090E boilers. Vent system must be con-structed only using venting materials listed in this Venting Manual. Existing vertical vents or chimneys may only be used as raceways for routing vent or
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