Used to support long horizontal runs exceeding 8'. • Easy-to-connect parts to simplify installation. • The stainless-steel wall features an exclusive thermal weave that promotes even airflow and lower outer wall temperatures. • Metallic black powder coat, which gives a good aesthetic appearance and helps to resist corrosion. • Laser welding: the different parts of the connection system are assembled by laser welding. This provides discreet, solid and durable joints. • Complies with NFPA 211, CSA B365, UL 103 HT and ULCS629 Standards **Dimensions** AØ : 6.75" YY : 8" - 12"