Which material can be used to ensure the durability of the inlet in a masonry chimney?

Using metal for the inlet of a masonry chimney is a sound choice due to its inherent durability and resistance to high temperatures. Metal components can withstand the stresses associated with the thermal expansion and contraction that occur when a chimney is in use. This material's robust nature helps prevent warping or cracking, which is essential for maintaining the integrity of the chimney and ensuring it operates safely and effectively.

Moreover, metal is less prone to corrosion when treated appropriately, making it suitable for exposure to various environmental conditions. In terms of fire safety, metal can endure significant heat, which is crucial for a chimney that vents smoke and gases from combustion.

Other materials such as wood, glass, and fabric do not offer the same level of heat resistance or structural integrity necessary for chimney applications. Wood can easily ignite and deteriorate in high temperatures; glass, while potentially durable at certain temperatures, can shatter or fail under thermal stress; and fabric does not provide the necessary strength or fire resistance. Thus, metal stands out as the most reliable choice for enhancing the durability of masonry chimney inlets.