ICC Commercial Mechanical Practice Exam

The recommended material for protecting the outlet of an open-air exhaust terminal is a metal or noncombustible screen. This choice is critical for several reasons.

First, metal or noncombustible screens provide a durable barrier that prevents the entry of birds, rodents, and debris into the exhaust system, which could otherwise obstruct airflow or damage the system. The use of noncombustible materials also enhances safety by minimizing fire hazards, as combustible materials could potentially ignite from the heat or sparks that might escape through the exhaust terminal.

Moreover, metal screens can withstand environmental factors like extreme weather conditions without deteriorating, ensuring a long-lasting protective measure. They help maintain proper airflow while ensuring that safety standards regarding fire and pest prevention are met. Thus, utilizing a metal or noncombustible screen not only fulfills functional needs but also adheres to building codes and regulations governing exhaust systems.