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M1 Residential Mechanical Inspector

ICC Exam Workbook Sample Questions

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34. For mechanical draft systems, the vent terminal shall be located not less than _____________ above a forced air inlet located within _______________, except for direct vent appliances.

A. 2 feet (610 mm), 5 feet (1524 mm)
B. 2 feet (610 mm), 10 feet (3048 mm)
C. 3 feet (914 mm), 10 feet (3048 mm)
D. 2 feet (610 mm), 12 feet (3658 mm)



35. Cutting and notching of flanges and lips of load-bearing members of cold-formed steel light frame construction ________________.

A. is permitted in certain instances
B. is not be permitted
C. is permitted if members are double before cutting or notching
D. none of the above


36. What is the minimum capacity in gallons for an expansion tank on a forced hot-water systems where the system volume is 70 gallons and the expansion tank is the non-pressurized type?

A. 7.5
B. 9.0
C. 10.5
D. 12.0



37. The maximum length of a clothes dryer exhaust duct shall not exceed ___________________ from the connection to the transition duct from the dryer to the outlet terminal. Exceptions ignored.

A. 8 feet (2438 mm)
B. 5 feet (1524 mm)
C. 35 feet (10,668 mm)
D. 30 feet (9,144 mm)



38. Auxiliary and secondary drain pan piping shall be a minimum of ____________________ nominal pipe size.

A. 1/2-inch (12.7 mm)
B. 1-inch (24.5 mm)
C. 3/4-inch (19 mm)
D. 1/4-inch (6.3 mm)


39. Where required, draft regulators shall be installed in the ______________________________ so that no difference in pressure will exist between the air at the regulator and the combustion air supply.

A. a different room or enclosure from the appliance
B. any room in the same building as the appliance
C. same room or enclosure as the appliance
D. first 12 inches of the vent pipe


40. Mechanical systems, both existing and new, and parts thereof shall be maintained in proper operating condition in accordance with the ______________________ and in a safe and sanitary condition.

A. NFPA
B. master installers’ instructions
C. rules of common sense
D. original design



41. In floor heating systems, Polypropylene pipe and tubing joints that are embedded concrete or gypsum shall be installed with ______________________________.

A. socket-type heat-fused polypropylene fittings
B. polybutylene pipe cement
C. compression connectors
D. solvent cement joints



42. An opening in the foundation not less than ___________________________, or a trap door not less than _______________________________ shall be provided for access to a floor furnace.

A. 22 inches by 30 inches (559 mm by 762 mm), 18 inches by 24 inches (457mm by 610 mm)
B. 18 inches by 24 inches (457mm by 610 mm), 22 inches by 30 inches (559 mm by 762 mm)
C. 18 inches by 24 inches (457mm by 610 mm), 18 inches by 24 inches (457mm by 610 mm)
D. 22 inches by 30 inches (559 mm by 762 mm), 22 inches by 30 inches (559 mm by 762 mm)


43. For fuel gas heating appliances, when combining spaces on the same story for purposes of combustion air requirements, each opening shall have a minimum free area of _______ square inch per 1,000 Btu/h of the total input rating of all appliances in the space, but not less than _______ square inches.

A. 2, 200
B. 3, 300
C. 1, 100
D. 10, 1000


44. Connectors, or thimbles entering a masonry chimney, shall _______________________.

A. be installed with a 1/2 in air gap on all sides.
B. be completely free of contact with the masonry except at the flue
C. be encased in thermal foam insulation
D. be firmly cemented into the masonry


45. Natural draft gas vents serving wall furnaces shall terminate at an elevation at least _____________ above the bottom of the furnace.

A. 4 feet (1219 mm)
B. 5 feet (1524 mm)
C. 8 feet (2438 mm)
D. 12 feet (3658 mm)
46. Which of the following may be required to appear on an appliance label?

A. Electrical rating in volts, amperes and motor phase, identification of individual electrical components in volts, amperes or watts and motor phase; and in Btu/h (W) output and required clearances.
B. Hourly rating in Btu/h (W), minimum hourly rating for units having step or automatic modulating controls, type of fuel, type of refrigerant, cooling capacity in Btu/h (W) and required clearances.
C. Hourly rating in Btu/h (W), type of fuel approved for use with the appliance and required clearances.
D. Name and trademark of the manufacturer, the model number or equivalent, the electric rating in volts, amperes and phase; Btu/h (W) output rating, individual marking for each electrical component in amperes or watts, volts and phase, required clearances from combustibles and a seal indicating approval of the appliance by an approved agency.
E. any or all of the above




47. The auxiliary pan drain shall discharge to a ___________________ to alert occupants in the event of a stoppage of the primary drain.

A. clear sewer disposal pipe hooked to the sewer system
B. floor drain
C. utility receptacle
D. conspicuous point of disposal




48. An attic passageway to access an appliance shall have continuous solid flooring, in accordance with Chapter 5, not less than ____________________ wide. Exceptions ignored.

A. 20 inches (508 mm)
B. 24 inches (610 mm)
C. 30 inches (762 mm)
D. 36 inches (914 mm)



49. Dryer exhaust systems shall be independent of all other systems and shall convey the moisture to ____________________. Exceptions ignored.

A. the outdoors
B. above the roofline
C. within 3 feet of the clothes dryer
D. a point higher than the dryer outlet


50. Piping and fittings for refrigerant vapor (suction) lines shall be insulated with insulation having a thermal resistively of at least __________.

A. R-3
B. R-4
C. R-6
D. R-11



51. Ducts shall be installed with at least ____________________ separation from earth except where they meet the requirements of Section M1601.1.2..

A. 4 inches (102 mm)
B. 6 inches (152 mm)
C. 10 inches (254 mm)
D. 12 inches (305 mm)




52. On a vented floor furnace the furnace register shall be located not less than ____________ from doors in any position, draperies or similar combustible objects.

A. 6 inches (152 mm)
B. 10 inches (254 mm)
C. 18 inches (457 mm)
D. 12 inches (305 mm)




53. Where ever wood-framed structural members are drilled, notched or altered, shield plates of steel material having a thickness of not less than _____________ inch, must be installed to protect the installed piping or equipment. Exceptions ignore.

A. 0.500
B. 0.2500
C. 0.0575
D. 0.0250



54. An auxiliary drain pan with a separate drain shall be installed ____________ the coils on which condensation will occur.

A. over
B. under
C. near
D. none of the above



55. Fluid in the supply side of a hydronic system may enter a tee fitting through the branch opening.

A. This is true
B. This is false




56. An appliance must have a level working space at least ______________________________________________________ provided in front of the control side to service an appliance.

A. 18 inches deep and 24 inches wide (457 mm by 610 mm)
B. 30 inches deep and 30 inches wide (762 mm by 762 mm)
C. 24 inches deep and 36 inches wide (610 mm by 914 mm)
D. 36 inches deep and 48 inches wide (914 mm by 1219 mm)



57. Indoor locations intended for hydrogen-generating or refueling operations shall be limited to a maximum floor area of ______________________________ and shall communicate with the outdoors in accordance with Sections M1307.4.1.1 and M1307.4.1.2.

A. 250 square feet (23 m2)
B. 500 square feet (46 m2)
C. 750 square feet (70 m2)
D. 850 square feet (79 m2)


58. For an appliance installed in an attic, if the access passageway is unobstructed and not less than 6 feet (1829 mm) high and 22 inches (559 mm) wide for its entire length, the passageway shall be not more than ________________________ long.

A. 20 feet (6 096 mm)
B. 30 feet (9 144 mm)
C. 40 feet (12 192 mm)
D. 50 feet (15 250 mm)


59. Furnaces having a firebox open to the atmosphere shall have at least a _____________________ working space along the front combustion chamber side. Exceptions ignored.

A. 6-inch (152 mm)
B. 3-inch (76 mm)
C. 9-inch (229 mm)
D. 12-inch (305 mm)


60. With regard to vented wall furnaces, panels, grilles and access doors that must be removed for normal servicing operations shall __________________________________.

A. be attached to the building construction
B. not be attached to the building construction
C. be constructed of stainless steel
D. be readily accessible to the disabled


61. A ________________________ shall be required for each cooling or evaporator coil where damage to any building components will occur as a result of overflow from the equipment drain pan or stoppage in the condensate drain piping.

A. overflow alarm system
B. secondary drain or auxiliary drain pan
C. float operated cutoff switch
D. any of the above


62. An attic has a furnace that is hanging from the rafters. There is no passageway with a level surface leading to the appliance as required in the code. This passageway and level service space are not required where ______________________________.

A. there is enough headroom to walk erect
B. the furnace is permanent
C. the appliance can be serviced and removed through the required opening
D. none of these


63. An installer has an 80,000 Btu per hour input appliance with a 4-inch-diameter draft hood outlet that needs to be vented into a 12-foot-high Type B vent. The vent connector has a 5-foot lateral length and is also Type B. Can this appliance be vented using a 4-inch-diameter vent?

A. Yes
B. No




64. Excavations for appliance installations shall extend to a depth of _______________ below the appliance and _______________ on all sides, except that the control side shall have a clearance of 30 inches (762 mm).

A. 16 inches (406 mm), 4 inches (102 mm)
B. 16 inches (406 mm), 8 inches (203 mm)
C. 12 inches (305 mm), 4 inches (102 mm)
D. 6 inches (152 mm), 12 inches (305 mm)
65. Above-ground duct systems shall be designed to limit discharge air temperature to a maximum of ___________.

A. 125°F (52°C)
B. 150°F (66°C).
C. 250°F (121°C)
D. none of the above


66. Vents for natural draft appliances shall terminate at least _________________ above the highest connected appliance outlet.

A. 24 inches (610 mm)
B. 4 feet (1219 mm)
C. 5 feet (1524 mm)
D. 8 feet (2438 mm)


67. Underground duct systems shall be constructed of approved __________________________.

A. concrete
B. clay
C. metal
D. plastic
E. any of the above



68. Pool heaters shall have _______________________.

A. temperature-relief valves
B. overflow valves
C. anti-siphon valves
D. none of the above







69. Ducts serving range hoods shall be constructed of _________________________________. Exceptions ignored.

A. galvanized steel
B. stainless steel
C. copper
D. PVC
E. A, B or C


70. The flue liner, chimney inner wall or vent inner wall shall be continuous and free of cracks, gaps, perforations, or other damage or deterioration that would allow the escape of combustion products, including gases, moisture and ____________.

A. rain water
B. smoke
C. fumes
D. creosote



71. Ducts in garages shall comply with the requirements of ____________________.

A. the designer
B. the fuel-gas code
C. Section R302.5.2.
D. Section R211.3(a)



72. What is the maximum horizontal support hanger spacing internal in feet for Copper or copper alloy tubing material?

A. 2 feet (610 mm)
B. 3 feet (914 mm)
C. 5 feet (1524 mm)
D. 6 feet (1829 mm)


73. Single draft-hood-equipped appliance. An installer has a 120,000 British thermal unit (Btu) per hour input appliance with a 5-inch-diameter draft hood outlet that needs to be vented into a 10-foot-high Type B vent system. What size vent should be used assuming (a) a 5-foot lateral single-wall metal vent connector is used with two 90-degree elbows, or (b) a 5-foot lateral single-wall metal vent connector is used with three 90-degree elbows in the vent system?

A. 4-inch vent and connector
B. 5-inch vent and connector
C. 6-inch vent and connector
D. 8-inch vent and connector



74. In return air openings for heating, ventilation and air conditioning systems, the return air shall not be taken from a ____________. Exceptions ignored.

A. furnace room
B. bedroom
C. hallway
D. living room



75. Where an appliance is permanently disconnected from an existing chimney or vent, or where an appliance is connected to an existing chimney or vent during the process of a new installation, the chimney or vent shall be resized as necessary to control flue gas ________________ in the interior of the chimney or vent and to provide the appliance, or appliances served, with the required draft.

A. flow
B. volume
C. direction
D. condensation





76. Where used, a draft hood or a ____________ shall be installed in the same room or enclosure as the appliance served so as to prevent any difference in pressure between the hood or regulator and the combustion air supply.

A. supply air balance regulator
B. exhaust air balance regulator
C. barometric draft regulator
D. none of these



77. If an appliance is installed in an underfloor area, a level service space at least ___________________________ wide shall be present at the front or service side of the appliance. Exceptions ignored.

A. 30 inches (762 mm) deep and 30 inches (762 mm)
B. 20 inches by 30 inches (508 mm) by 762 mm)
C. 30 inches (762 mm) deep and 36 inches (914 mm)
D. 24 inches (610 mm) deep and 24 inches (610 mm)



78. The chimney and vent connector clearances to combustible materials for Type L vent piping connectors with oil and a solid-fuel appliance is ___________________.

A. 9 inches (229 mm)
B. 12 inches (305 mm)
C. 18 inches (457 mm)
D. 24 inches (610 mm)


79. The space surrounding a flue lining system or other vent installed within a masonry chimney may be used for the ____________________________________ in accordance with the manufacturer’s installation instructions and this code.

A. other appliances directly connected
B. installation of a separate flue lining
C. for a wood burning appliance
D. none of the above
80. A 35,000 Btu per hour input draft-hood equipped water heater with a 4-inch-diameter draft hood outlet, 2 feet of connector rise, and 4 feet of horizontal length is to be common vented with a 100,000 Btu per hour fan assisted furnace with a 4-inch-diameter flue collar, 3 feet of connector rise, and 6 feet of horizontal length. The common vent consists of a 30-foot height of Type B vent. What are the recommended vent diameters for each connector and the common vent?

A. The installer may use a 4-inchdiameter, single-wall metal vent connector for the water heater and a 4-inch-diameter, single-wall metal vent connector for the furnace. The common vent should be a 5- inch-diameter Type B vent.
B. The installer may use a 3-inchdiameter, single-wall metal vent connector for the water heater and a 4-inch-diameter, single-wall metal vent connector for the furnace. The common vent should be a 4- inch-diameter Type B vent.
C. The installer may use a 4-inchdiameter, single-wall metal vent connector for the water heater and a 4-inch-diameter, single-wall metal vent connector for the furnace. The common vent should be a 4- inch-diameter Type B vent.
D. The installer may use a 5-inchdiameter, single-wall metal vent connector for the water heater and a 3-inch-diameter, single-wall metal vent connector for the furnace. The common vent should be a 6- inch-diameter Type B vent.





81. What is the minimum capacity in gallons for an expansion tank on a forced hot-water systems where the system volume is 20 gallons and the expansion tank is the non-pressurized type?

A. 1.5
B. 3.0
C. 4.5
D. 6.0

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