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2024 International Mechanical Code
Chapter 6

IMC 2024

2024 International Mechanical Code

Chapter 6Duct Systems

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Question 1 1.

Duct systems discharging combustible material directly into any combustion chamber must conform to the requirements of which standard?

NFPA 90A
NFPA 82
NFPA 70
SMACNA 006

Question 2 2.

Under what condition is it permissible to use a corridor as a source of makeup air for exhaust systems in adjacent toilet rooms?

The corridor is equipped with smoke detectors.
The exhaust rate is less than 50 cfm.
The corridor is supplied with outdoor air at a rate greater than the makeup air taken.
The toilet room has no windows.

Question 3 3.

In a tenant space of 900 square feet, which of the following is permitted regarding return air?

Return air may not be conveyed via corridors.
Corridors may be used for conveying return air.
Only exhaust air is permitted in the corridor.
Smoke dampers must be installed at every 10 feet.

Question 4 4.

A return air plenum located in the space between a corridor ceiling and the floor above is permitted if the air-handling system shuts down upon detection of sprinkler waterflow, provided what else is true?

The building is equipped throughout with an automatic sprinkler system.
The corridor is a fire-resistance-rated assembly.
The plenum is constructed of noncombustible materials only.
The air-handling unit serves at least three floors.

Question 5 5.

Which of the following is required for ductwork located within an exit enclosure for ventilation?

The duct must be connected to the building's general HVAC system.
The intake air must be taken directly from the outdoors.
The duct must have a fire rating of 3 hours.
The duct must be made of flexible nonmetallic material.

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