MAD Anti-Downdraught Chimney Liner Cowl – 6 (Terracotta Finish) Upgrade your chimney system with the MAD Anti-Downdraught Chimney Liner Cowl – 6, to eliminate downdraught problems and protect against birds, debris and rain ingress. Designed for 6 flexible flue liners, this robust and stylish cowl attaches securely without removing your chimney pot, making installation quick and easy. Finished in a lovely painted terracotta, it matches your traditional chimney design and gives long lasting performance and improved chimney efficiency. Key Features & Benefits Anti-Downdraught Solution – Stops smoke blowback and improves chimney performance. 6 Liner Compatible – Designed for 6 flexible flue liners.