Why is a chimney important? A chimney is important because it ensures that combustion gasses are safely and effectively vented out of a building. Without a chimney, these gasses could accumulate inside the building and pose a serious health hazard. moduet2023-06-29T02:59:21+00:00June 29th, 2023|Chimney| Share This Story, Choose Your Platform! FacebookTwitterLinkedInPinterest