FSD HVAC Systems & Airflow Control 5

Question 1

Under NFPA 105, smoke dampers in smoke control systems must be inspected and operationally tested at what minimum frequency after the first year of service?

Accepted Answer

Every 4 years

Answer

NFPA 105 requires operational testing of smoke dampers every 4 years (after the initial 1-year test), although authorities having jurisdiction may require more frequent testing.

Question 2

A corridor smoke damper that fails to close during an operational test should be:

Accepted Answer

Tagged out of service and the deficiency reported to the building owner for repair

Answer

A failed smoke damper must be taken out of service, documented, and reported to the building owner for prompt repair; no workarounds that leave the smoke control system impaired are acceptable.

Question 3

When multiple smoke dampers are connected to a single exhaust fan in a shaft smoke exhaust system, which control arrangement is required?

Accepted Answer

Only the damper on the fire floor opens; all others remain closed

Answer

In a shaft exhaust smoke control system, only the damper on the floor of fire origin opens to direct exhaust from that floor; closing all other dampers maximizes smoke extraction at the fire floor.

Question 4

A fire damper installed in a duct that passes through a 2-hour fire-rated floor assembly must be rated to resist fire for at least how long if the duct is used for non-combustible HVAC service?

Accepted Answer

2 hours

Answer

The fire damper must match the fire-resistance rating of the assembly it penetrates; a 2-hour floor assembly requires a damper with a minimum 2-hour fire-resistance rating.

Question 5

Which of the following best describes the role of a 'position indicator' on a smoke damper actuator?

Accepted Answer

It provides a local and/or remote signal confirming whether the damper is open or closed

Answer

A position indicator (end switch or feedback signal) confirms the actual blade position to the fire alarm or building automation system, verifying the damper has fully responded to its control command.

(FSD) Fire and Smoke Damper Certification Practice Test

(FSD) Fire and Smoke Damper Certification Practice Test

FSD HVAC Systems & Airflow Control 5