FSD HVAC Systems & Airflow Control 2

Question 1

Which NFPA standard governs the installation of fire dampers in HVAC duct systems?

Accepted Answer

NFPA 90A

Answer

NFPA 90A, Standard for the Installation of Air-Conditioning and Ventilating Systems, governs fire damper installation in HVAC ductwork.

Question 2

A combination fire/smoke damper must comply with which UL standard?

Accepted Answer

Both UL 555 and UL 555S

Answer

Combination fire/smoke dampers must comply with both UL 555 (fire dampers) and UL 555S (smoke dampers) since they perform both functions.

Question 3

What is the primary purpose of an actuator on a motorized smoke damper?

Accepted Answer

Open or close the damper blades upon receiving a control signal

Answer

The actuator is the electromechanical device that physically positions the damper blades open or closed in response to a control signal from the fire alarm or building automation system.

Question 4

In a variable air volume (VAV) HVAC system, why is damper leakage rating especially important?

Accepted Answer

Leakage affects the accuracy of zone temperature control and can compromise smoke containment

Answer

In VAV systems, damper leakage affects zone temperature accuracy and, critically, can allow smoke migration past a closed smoke damper during an emergency.

Question 5

A fire damper installed in a rated floor-ceiling assembly must achieve which minimum fire-resistance rating when the assembly is rated at 2 hours?

Accepted Answer

2 hours

Answer

Fire dampers must have a fire-resistance rating at least equal to the rating of the assembly in which they are installed; a 2-hour assembly requires a 2-hour damper.

(FSD) Fire and Smoke Damper Certification Practice Test

(FSD) Fire and Smoke Damper Certification Practice Test

FSD HVAC Systems & Airflow Control 2