Cadel Upper Concentric Kit – for Cadel pellet stovesCadel Upper Concentric Kit for Cadel pellet stoves The kit proposed here is the dedicated and necessary optional to be able to connect the CADEL ATENA PLUS DUKE SABA pellet stoves to a concentric duct for the exhaust of fumes and the air supply. The rigid pipe fits onto the flue outlet located at the bottom of the stove's back panel, while the flexible pipe connects to the combustion air intake pipe. Properly secured and secured to the stove with the