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International Code Council Commercial Mechanical Inspector Sample Questions:

1. When testing dampers located in corridors, the dampers shall demonstrate acceptable closure performance when subjected to _____ fpm velocity across the face of the damper using the UL 555 fire exposure test.

A) 100
B) 150
C) 200
D) 75

2. The minimum dimension for rectangular air ducts used to supply combustion air for natural draft systems is
_____ inches.

A) 3
B) 6
C) 4
D) 2

3. For the installation of listed fuel-burning appliances, the required clearances should be found:

A) by using a calculation based on the Btu/h output rating of the appliance.
B) in the mechanical code.
C) on the approved plans and specifications for the building.
D) on the nameplate of the appliance.

4. Given: a six-story, sprinklered, multifamily building with a continuously ventilated shaft extending vertically from the first floor to the roof and used for exhaust.
Which of the following requirements must also be met?

A) fire dampers are installed that are connected to an emergency generator rated for 1 hour.
B) kitchen exhaust that penetrates the shaft without a fire damper and extends vertically 22 inches.
C) kitchen exhaust that penetrates the shaft without a fire damper and extends vertically 12 inches.
D) have steel subducts with wall thickness of 0.0186 inch extending 22 inches horizontally into the shaft.

5. The exhibit shows a _____ in. diameter gas line between unit heaters 5 and 8.

A) 1
B) 1-1/8
C) 1-1/4
D) 3/4

Solutions: