Existing duct flue was single wall pipe. Replaced duct flue with matching b-vent pipe and fire caulked. Also added single wall pipe around b-vent and fire caulked. Phone #: ###-#### Inspection requested via web by shawn miller- need weather tie whip on a/c to disconnect- need uv protection on line set at a/c outdoors- please forward pics of install on fluing thru return air to bscoles@cityofboise.org so i can verify install