Which type of brush is recommended for cleaning the flue of a brick chimney?

The recommended type of brush for cleaning the flue of a brick chimney is a polypropylene brush. This choice is primarily due to the properties of polypropylene material, which is both durable and effective at removing creosote buildup while being less abrasive to the chimney's interior surfaces than other materials. The flexibility of the polypropylene bristles allows them to conform to irregularities in the chimney flue, ensuring a thorough clean without damaging the flue lining.

Additionally, polypropylene brushes resist moisture and won't absorb creosote or other byproducts, making them easier to clean and maintain for repeated use. Using the right brush is important, as selecting a brush that is too harsh or inflexible could potentially scrape or damage the flue, leading to more significant issues in the chimney structure over time. Overall, polypropylene brushes strike the best balance between effectiveness and safety when it comes to cleaning brick chimney flues.