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and ULC.S629 (650°C) for Canada. . This wood burning unit is only listed for installation with 6.0” diameter chimney connector and chimney systems. Installing this unit on prefabricated chimneys larger than 6.0” diameter will result in decreased draft and the potential for poor unit performance. . Follow all venting system manufacturer’s installation requirements and required clearances. . Use three sheet metal screws at each single wall chimney connector joint (check manufacturer’s recommendati