Cast-iron fittings shall _____ _____ _____.

The statement that cast-iron fittings shall not be used aligns with specific guidelines in the North Carolina Mechanical Code concerning the types of materials and fittings permissible in certain applications. In many situations, cast-iron fittings are limited or prohibited due to concerns about their weight, fragility, and the potential for corrosion when exposed to certain types of environments or chemicals.

While there are indeed applications where cast-iron may have historically been used or could be regarded as cost-effective or reinforced, modern practices emphasize the use of more reliable, durable materials that offer improved performance and safety. This decision stems from significant advancements in materials science and the goal of enhancing system longevity and reducing maintenance needs.

In summary, the prohibition against the use of cast-iron fittings reflects a deliberate choice to prioritize safety, performance, and compliance with contemporary mechanical coding standards, which often advocate for alternatives that better serve the demands of modern construction and maintenance.