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Updated: Jun 07, 2026
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International Code Council Commercial Mechanical Inspector Sample Questions:
1. For gas piping installations, which of the following is an acceptable joining method for polyethylene (PE) pipe?
A) Threaded coupling
B) Rubber cement
C) Solvent cement
D) Compression coupling
2. Given: Fabricated of type 430 stainless steel.
Optional type _____ stainless steel is available.
A) 303
B) 316
C) 301
D) 304
3. 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) kitchen exhaust that penetrates the shaft without a fire damper and extends vertically 12 inches.
B) fire dampers are installed that are connected to an emergency generator rated for 1 hour.
C) kitchen exhaust that penetrates the shaft without a fire damper and extends vertically 22 inches.
D) have steel subducts with wall thickness of 0.0186 inch extending 22 inches horizontally into the shaft.
4. Given: A recirculating industrial direct-fired makeup air heater has a rated input of 200,000 Btu/h .
Ventilation air is supplied by separate mechanical means.
Outside ventilation air shall be provided to supply at least _____ CFM.
A) 1250
B) 250
C) 800
D) 400
5. 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) 200
B) 150
C) 75
D) 100
Solutions:
| Question # 1 Answer: D | Question # 2 Answer: D | Question # 3 Answer: C | Question # 4 Answer: C | Question # 5 Answer: B |
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