International Code Council Commercial Mechanical Inspector M2 Exam Dumps: Updated Questions & Answers (May 2026)

Based on the mechanical plan shown in the exhibit, the gas line between unit heaters 5 and 8 is labeled as 1 inch in diameter. Therefore, the correct answer is B.

The IMC appliance provisions prohibit duct connection to a vented wall furnace . That makes Option B correct. The exam tests recognition of appliance-specific distribution restrictions rather than general duct rules.

The ICC mechanical code provision for infrared radiant heaters states that the heaters must be installed with clearances from combustible material in accordance with the manufacturer’s installation instructions . That makes Option D the correct answer. The code does not establish a blanket 6-foot clearance on all sides in this section, and the exam expects the candidate to rely on the listed installation requirements for the appliance.

The IMC requires clothes dryer exhaust ducts to terminate outside the building and to be equipped with a backdraft damper at the terminal. The code also prohibits screens at dryer terminations because lint can accumulate and obstruct flow. That makes Option A correct and eliminates Option C . The other two choices describe controls not required by the dryer exhaust termination rule.

The IMC states that solar thermal equipment exposed to vehicular traffic must be installed not less than 6 feet above the finished floor . It then gives an exception stating that this requirement does not apply where the equipment is protected from motor vehicle impact . Because the height requirement is removed by that exception, the best answer from the choices given is A, directly on finished floor . This is an inference from the exception language.

For this type of continuously ventilated exhaust shaft serving a multifamily building, the code requires the kitchen exhaust connection to penetrate the shaft and extend vertically not less than 22 inches without a fire damper. That matches Option D .

The ICC mechanical administrative inspection sequence includes underground inspection , rough-in inspection , and final inspection as required inspections. An annual system test is not listed as one of the required permit inspections in that section, so Option D is the correct answer. This fits the M2 General Administration content area, which includes permit and inspection administration.

The applicable provision requires direct-fired industrial air heaters to supply outside ventilation air at a rate of not less than 4 cfm per 1,000 Btu/h of rated input where ventilation air is provided by separate mechanical means. For 200,000 Btu/h , the required outside air is:

200,000 ÷ 1,000 = 200

200 × 4 = 800 cfm

So the correct answer is C

The IFGC section on test medium states that the test medium shall be air, nitrogen, carbon dioxide or an inert gas , and specifically states that oxygen shall not be used as a test medium . That makes C the correct answer.

The IMC special exhaust provisions require exhaust outlets terminating at temperatures exceeding 600°F to be designed as a chimney , and the table language identifies this as a single-wall metal chimney . Therefore, Option D is correct.