An insulation shield for vents passing through insulated assemblies must be made from what gauge sheet metal?

The requirement for insulation shields for vents passing through insulated assemblies is designed to ensure safety and compliance with mechanical codes. According to the North Carolina Mechanical Code, when vents pass through areas insulated for thermal efficiency, the use of a specific gauge sheet metal is mandated to provide the necessary fire safety and durability.

Choosing a No. 26 gauge sheet metal for insulation shields strikes a balanced compromise between being thick enough to withstand the heat and potential wear while still being manageable in terms of weight and workability. This gauge helps prevent issues such as warping or melting under high temperatures that can occur near vent systems.

In this context, using a thicker gauge could add unnecessary weight and be more challenging to work with, while a thinner gauge might not provide adequate protection or durability. The selection of No. 26, therefore, adheres to safety standards that protect the integrity of the insulated assembly while managing the practical aspects of installation and maintenance.