ICC Commercial Mechanical Practice Exam

Which of the following is true regarding combination fire/smoke dampers in duct work?

1. They are required to be installed in all circumstances

2. They will not be allowed as per the code

3. They may be used, or individual fire and smoke dampers can be installed

4. None of these

The correct answer is: They may be used, or individual fire and smoke dampers can be installed

Combination fire/smoke dampers are utilized in ductwork to provide both fire protection and smoke control within the HVAC system. They can be particularly advantageous because they serve a dual purpose, allowing for a streamlined installation where both functions are needed, while also potentially saving space and installation costs. The use of combination dampers is permissible in specific applications as long as they meet the requirements set forth by the applicable codes. Therefore, their presence in a system is conditional rather than mandatory, and there are scenarios where individual fire dampers and smoke dampers can be used instead. This flexibility allows designers and engineers to choose the best solution based on the specific needs of the building's design and regulatory requirements. This understanding highlights why the option regarding their use alongside individual dampers is the correct choice.