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2027 International Mechanical Code
Chapter 6

IMC 2027

2027 International Mechanical Code

Chapter 6Air Movement

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Question 1 1.

A new commercial building design utilizes the corridor as a source of makeup air for exhaust systems in adjacent toilet rooms and janitor closets that open directly onto the corridor. What specific airflow condition must be met for this installation to be permitted?

The corridor must be equipped with combination fire/smoke dampers at every exhaust penetration
The corridor must be directly supplied with outdoor air at a rate greater than the rate of makeup air taken from the corridor
The corridor must maintain a negative pressure of at least 0.05 inch water gauge relative to the toilet rooms
The corridor exhaust airflow rate must equal 100 percent of the total supply airflow rate

Question 2 2.

An above-ceiling space between a corridor ceiling and the floor structure above is proposed to be used as a return air plenum in a business occupancy. Which of the following conditions is an approved condition allowing this installation?

The corridor is provided with manual fire alarm pull stations every 50 feet
The ceiling plenum is constructed entirely of sheet metal lining of not less than 24 gauge
The return air velocity in the corridor ceiling plenum does not exceed 1,000 feet per minute
The air-handling system serving the corridor is shut down upon detection of sprinkler waterflow where the building is equipped throughout with an automatic sprinkler system

Question 3 3.

Ventilation equipment and ductwork for an exit enclosure are located within a multi-story commercial building. How must the equipment and ductwork be separated from the remainder of the building?

With construction as required by the International Building Code for shafts
With 26-gauge sheet metal enclosures lined with 2 inches of fiberglass insulation
With a continuous noncombustible thermal barrier having a 1-hour rating
With 1-hour smoke barriers equipped with dynamic combination fire/smoke dampers

Question 4 4.

Which of the following describes the relationship required between an exit enclosure ventilation system and other building ventilation systems?

They shall share common outdoor air intakes but separate exhaust ducts
They must be modulated simultaneously by the central building management system
They may be interconnected if provided with supervisory smoke dampers
Exit enclosure ventilation systems shall be independent of other building ventilation systems

Question 5 5.

An exhaust duct operating under positive pressure is routed through a building. Under general code provisions, what is the restriction regarding positive pressure exhaust ducts and plenums?

They are permitted in plenums if the static pressure is less than 2 inches water column
They must be installed in a welded steel conduit with minimum 16-gauge thickness
Exhaust ducts under positive pressure shall not extend into or pass through ducts or plenums
They must be wrapped with a 2-hour fire-rated duct wrap when passing through plenums

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