HUUM Thru-Wall Backside Connection Chimney KitSauna Wood Stove Chimney Set, Thru Wall Backside Connection The HUUM Thru Wall Backside Connection Chimney Set is designed to extend through the wall with a backside connection and is compatible with HUUM Sauna Stoves. This premium set includes everything needed to provide your sauna experience with both beautiful form and safe minded function. Features Through the wall Backside connection Mounts in vertical position Works with smaller spaces