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Commercial Mechanical Inspector Question and Answers

Commercial Mechanical Inspector

Last Update Apr 15, 2026
Total Questions : 50

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Questions 1

Horizontal terminations for mechanical draft systems that are adjacent to public walkways shall be located a minimum of _____ feet above grade.

Options:

A.  

7

B.  

8

C.  

9

D.  

10

Discussion 0
Questions 2

Where the cooking surface has exposed flame and burners, the minimum distance between the lowest edge of a grease filter and the cooking or heating surface shall be _____ inches.

Options:

A.  

18

B.  

24

C.  

42

D.  

48

Discussion 0
Questions 3

To test for tightness, a consumer’s gas piping should never be filled with:

Options:

A.  

air.

B.  

dry air.

C.  

oxygen.

D.  

inert gas.

Discussion 0
Questions 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.

Options:

A.  

250

B.  

400

C.  

800

D.  

1250

Discussion 0
Questions 5

The exhaust outlet for a clothes dryer is required to be equipped with:

Options:

A.  

a backdraft damper.

B.  

an automatically controlled volume damper.

C.  

a corrosion-resistant screen of 1/4-inch mesh.

D.  

a temperature limit control device that will automatically shut off the system at a temperature of 250°F.

Discussion 0
Questions 6

Indoor combustion air shall be provided within:

Options:

A.  

1 foot of the ceiling and 1 foot of the floor.

B.  

1 foot of the ceiling and 2 feet of the floor.

C.  

2 feet of the ceiling and 1 foot of the floor.

D.  

2 feet of the ceiling and 2 feet of the floor.

Discussion 0
Questions 7

ERV systems shall not be installed in which of the following except:

Options:

A.  

systems utilizing coil-type exchangers.

B.  

common exhaust systems for clothes dryers.

C.  

exhaust systems emitting corrosive materials.

D.  

equipment designed to assist in the evacuation of occupants.

Discussion 0
Questions 8

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

Options:

A.  

3/4

B.  

1

C.  

1-1/8

D.  

1-1/4

Discussion 0
Questions 9

A cooling system with a condensate disposal system:

Options:

A.  

shall be made of approved corrosion-resistant material and shall not decrease in size from the drain pan connection to the place of condensate disposal.

B.  

shall be made of an approved pipe and be at least 1/2-inch in diameter.

C.  

shall not be less than 3/4-inch PVC pipe or equivalent approved material.

D.  

shall have all horizontal sections of drain piping installed with a minimum of 1/4 inch per foot slope.

Discussion 0
Questions 10

Unless listed for a greater or smaller dimension, mechanical draft venting systems shall terminate a minimum of _____ feet below an openable window.

Options:

A.  

1

B.  

4

C.  

8

D.  

12

Discussion 0
Questions 11

Infrared radiant heaters shall be installed:

Options:

A.  

in accordance with UL 2158.

B.  

in accordance with UL 1240.

C.  

with a 6-ft. clearance on all sides.

D.  

with clearances from combustible material in accordance with the manufacturer’s installation instructions.

Discussion 0
Questions 12

Floor furnaces shall not be closer than _____ inches to the ground.

Options:

A.  

[option text not fully visible in the material you sent]

B.  

[option text not fully visible in the material you sent]

C.  

[option text not fully visible in the material you sent]

D.  

12

Discussion 0
Questions 13

All exposed gas piping shall be kept above grade a minimum of _____ inches.

Options:

A.  

3.5

B.  

6

C.  

8.5

D.  

12

Discussion 0
Questions 14

Shutoff valves in plastic pipe ground-source heat pump loop systems shall be installed on both sides of which one of the following?

Options:

A.  

Expansion tanks

B.  

Heat-fusion joints

C.  

Change-in-material joints

D.  

Pressure-reducing valves

Discussion 0
Questions 15

Exhibit:

What hp is EF-2?

Options:

A.  

1/2

B.  

1

C.  

1.5

D.  

2

Discussion 0