F80 High-Rise Building Construction and Compartmentalization 4

Question 1

In a multi-story high-rise, exit stair enclosures are typically required to have a fire-resistance rating of at least:

Accepted Answer

2 hours

Answer

Stair enclosures in buildings four or more stories tall generally need a 2-hour fire-resistance rating.

Question 2

A door installed in a 2-hour rated wall typically needs a fire-protection rating of:

Accepted Answer

1½ hours

Answer

Openings in 2-hour walls are usually protected by 1½-hour rated fire doors.

Question 3

When smoke is detected in the HVAC system of a high-rise office building, the system is normally designed to:

Accepted Answer

Shut down or switch to a smoke-control mode

Answer

Duct smoke detectors shut down air handling or start smoke-control sequences so the HVAC does not spread smoke.

Question 4

Stairwell door locks in NYC high-rise office buildings must release automatically when:

Accepted Answer

The fire alarm system is activated

Answer

Fail-safe stair door locks release when the fire alarm activates so occupants can re-enter floors from the stairs.

Question 5

Which feature best limits horizontal fire spread on a single high-rise floor?

Accepted Answer

Fire-rated partitions with self-closing doors

Answer

Compartmentation with rated walls and self-closing doors keeps fire and smoke within one area of the floor.

F80 Practice Test