Which air terminal should be installed on a heavy-duty smokestack?

A lead sheathed copper point terminal is the most appropriate choice for installation on a heavy-duty smokestack due to its superior properties in terms of corrosion resistance and durability in harsh environmental conditions. Smokestacks are often exposed to extreme temperatures, chemical emissions, and various weather conditions, which can accelerate corrosion and reduce the effectiveness of the lightning protection system.

The lead sheathing offers an additional layer of protection, enhancing the lifespan of the copper terminal beneath it. Copper is highly conductive, ensuring that the lightning current is efficiently carried away, while the lead sheathing prevents degradation from environmental factors.

In contrast, while aluminum and steel terminals may be more cost-effective, they do not provide the same level of corrosion resistance and reliability necessary for the demanding atmosphere of a smokestack environment. Copper terminals without lead sheathing, though conductive, may not withstand the same level of environmental stress over time as effectively as a lead sheathed copper terminal would. These characteristics make the lead sheathed copper point terminal the optimal choice for ensuring both safety and longevity in lightning protection for heavy-duty smokestacks.