Welcome to our Boiler Flues collection, where functionality meets safety. Horizontal flues exit straight out of the external wall, situated behind the boiler, while vertical flues are installed through the roof, ideal for boilers not located on external walls. Boiler Flue Extensions are designed to extend your boiler's flue outlet system with additional lengths in either horizontal or vertical orientations. It's crucial to match the brand of the extension with the manufacturer of your flue piping system for optimal compatibility and safety.