M2 Free Certification Exam Easy to Download PDF Format 2026 [Q30-Q47]

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M2 Free Certification Exam Easy to Download PDF Format 2026

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International Code Council M2 Exam Syllabus Topics:

Section	Weight	Objectives
Topic 1: Chimneys & Vents	14%	– Factory-built chimneys and vents – Vent systems and connections – Chimney construction and materials – Clearances and termination requirements
Topic 2: Heating, Cooling & Water Heaters	18%	– Boilers and hydronic systems – Heat pumps and cooling equipment – Water heaters and storage tanks – HVAC equipment installation and clearance – Solar thermal systems
Topic 3: Combustion Air	8%	– Air supply and venting – Combustion air requirements – Confined spaces and equipment rooms
Topic 4: Duct Systems	12%	– Duct construction and materials – Insulation and sealing – Duct installation and supports – Dampers and access doors
Topic 5: Exhaust & Ventilation Systems	20%	– Makeup air systems – Hazardous and special exhaust systems – Commercial kitchen exhaust systems – Ventilation rates and outdoor air requirements
Topic 6: General Administration	18%	– Plan review and documentation – Permits and inspections – Code authority and enforcement – Manufacturer’s instructions and listings
Topic 7: Fuel Supply Systems	10%	– Piping testing and inspection – Gas appliances and connections – Fuel gas piping materials and installation – Pressure regulation and overpressure protection

Q30. Horizontal terminations for mechanical draft systems that are adjacent to public walkways shall be located a minimum of _____ feet above grade.

The fuel gas venting provisions state that the exit terminals of mechanical draft systems shall be not less than
7 feet above grade where located adjacent to public walkways. Therefore, A is the correct answer.

Q31. Natural, manufactured and liquefied petroleum, or a mixture of these, make up:

fuel oil.

fuel gas.

natural gas.

liquefied petroleum gas.

The IFGC definition of fuel gas is: natural gas, manufactured gas, liquefied petroleum gas or mixtures of these gases . That definition directly matches Option B .

Q32. Given: The listed clearance is 12 inches.

What would be the reduced clearance to combustibles, in inches, if the millboard is replaced with 24-gauge sheet metal?

For a clearance-reduction system using 24-gauge sheet metal with a ventilated 1-inch air space , the recognized reduction method brings a 12-inch listed clearance down to 4 inches . That matches Option B .
This is also consistent with the protection method shown in the exhibit.

Q33. All exposed gas piping shall be kept above grade a minimum of _____ inches.

3.5

8.5

The IFGC rule for above-ground outdoor piping requires piping installed outdoors to be elevated not less than 3 1/2 inches above ground , and where installed across roof surfaces, not less than 3 1/2 inches above the roof surface . Therefore, the correct answer is A .

Q34. Shutoff valves in plastic pipe ground-source heat pump loop systems shall be installed on both sides of which one of the following?

Expansion tanks

Heat-fusion joints

Change-in-material joints

Pressure-reducing valves

In the IMC hydronic piping provisions for ground-source heat pump loop systems, shutoff valves are required on both sides of a pressure-reducing valve . That matches D . Heat-fusion joints and change-in-material joints do not trigger this two-sided shutoff-valve requirement.

Q35. When a permit is issued, the code requires that one set of approved plans and specifications be returned to the applicant.
This set of plans and specifications shall be:

kept on the building site.

returned to the architect.

filed with the county clerk or jurisdiction to properly record the property.

retained by the applicant for at least one year after the job is finished in the event modifications are made.

Under the ICC administrative provisions used with the mechanical code, one approved set is retained by the code official, and one approved set is returned to the applicant. The returned set must be kept on the site of the building or job while the authorized work is in progress. That directly matches Option A . It does not require return to the architect, filing with the county clerk, or retention for one year after completion.

Q36. The exhibit shows a _____ in. diameter gas line between unit heaters 5 and 8.

3/4

1-1/8

1-1/4

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.

Q37. 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.

250

400

800

1250

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

Q38. Air mechanically exhausted from a room must be:

filtered.

recirculated.

discharged into the attic.

discharged to the outdoors.

The IMC requires air removed by a mechanical exhaust system to be discharged outdoors to an approved location and not be readily drawn back into the building. That makes D correct. The code does not permit general exhaust air to terminate in an attic, and it does not make filtering or recirculation the default rule for mechanically exhausted air.

Q39. Ducts shall not be permitted to be connected to:

an evaporative cooler.

a vented wall furnace.

a gravity-type warm-air furnace.

a high-static-pressure-type unit heater.

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.

Q40. Exhaust outlets that terminate at a temperature exceeding 600°F shall be designed as a:

Class I duct.

Class II duct.

Class III duct.

single-wall metal chimney.

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.

Q41. An equipment shutoff valve shall be in the same room and not more than how many feet away from the appliance?

The IFGC requires the appliance shutoff valve to be located in the same room as the appliance and within
6 feet of the appliance . Therefore, the correct answer is A .

Q42. Where located on a roof with a 5:12 slope, a level platform shall be provided along the access panel of the furnace at least _____ inches wide.

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

For appliances on roofs, ICC access provisions require a level platform at the appliance. The platform must be not less than 30 inches in any dimension . For the choices provided, that makes 30 inches the correct answer, which is Option C .

Q43. For gas piping installations, which of the following is an acceptable joining method for polyethylene (PE) pipe?

Rubber cement

Solvent cement

Threaded coupling

Compression coupling

This item appears to use older or simplified exam wording . Current ICC language for polyethylene plastic piping identifies heat-fusion joints, electrofusion joints, and stab-type insert fittings as the named PE joining methods, not solvent cement or threaded couplings. Among the answer choices you provided, D.
Compression coupling is the only choice that aligns most closely with a mechanical fitting/joining approach for PE systems, while rubber cement, solvent cement, and threaded coupling do not match ICC PE joining practice. Because of that, D is the best answer from the listed options, but this question should be tied to the exact code cycle or source exam bank if you want absolute cycle-specific certainty

Q44. What type of cooking appliance is required to have its own independent hood and exhaust system?

Light-duty

Medium-duty

Heavy-duty

Extra-heavy-duty

The IMC specifically provides that Type I hoods used over extra-heavy-duty cooking appliances shall not cover other appliances requiring fire-extinguishing protection and shall discharge to an independent exhaust system . Therefore, D is correct.

Q45. ERV systems shall not be installed in which of the following except:

systems utilizing coil-type exchangers.

common exhaust systems for clothes dryers.

exhaust systems emitting corrosive materials.

equipment designed to assist in the evacuation of occupants.

The IMC prohibits energy recovery ventilation systems in several applications, including hazardous exhaust systems , smoke control systems , commercial kitchen exhaust systems , and clothes dryer exhaust systems . Equipment intended to assist with occupant evacuation falls under smoke-control/life-safety type applications and is not an allowed ERV use. By contrast, systems utilizing coil-type exchangers are the exception among the listed choices because they are not one of the prohibited applications in this question.
Therefore, Option A is correct.

Q46. When a furnace is installed in a 66-inch-high attic, the maximum distance from the passageway access to the furnace shall be _____ ft., measured along the centerline of the passageway.

ICC mechanical access provisions for appliances in attics require the passageway to be not more than 20 feet in length , measured along the centerline of the passageway from the opening to the appliance, where the attic passageway is the standard reduced-height access condition. Since the attic height given is 66 inches, the standard maximum length applies, so Option C is correct. The 50-foot allowance applies only under a different exception where the passageway is unobstructed and at least 6 feet high for its entire length.

Q47. Supports for hazardous exhaust duct shall be constructed of:

fibrous material.

material complying with UL 181.

plastic.

noncombustible material.

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