2015 International Residential Code
Mechanical Code Master Set Exam
Questions with Correct Answers
IMC/Residential
In order for someone to service an appliance other than a room heater, a minimum
working space of______ inches deep by 30 inches wide shall be provided in front of the
control side of the appliance. - ANSWER-30
M1305.1
IMC/Residential
For the purpose of providing working space, a furnace or air handler located within a
closet or similar compartment shall be provided with a minimum of ______ clearance
along the sides, back and top of the appliance, with the total width of the enclosing
space a minimum of ______wider than the furnace. - ANSWER-3 inches, 12 inches
M1305.1.1
IMC/Residential
A minimum ______ working space shall be provided along the front combustion
chamber side of a central furnace having a firebox open to the atmosphere. - ANSWER-
6-inch
M1305.1.1
IMC/Residential
Where an appliance is installed in a compartment accessed by a passageway, the
passageway shall have a minimum unobstructed width of ______, but not less tham
necessary to allow removal of the largest appliance in the space. - ANSWER-24 inches
M1305.1.2
IMC/Residential
Where an appliance is installed in an attic, the clear access opening shall be a minimum
of ______, but in no case less than necessary to allow removal of the largest appliance.
- ANSWER-20-inches by 30-inches
M1305.1.3
IMC/Residential
,Appliances suspended from the floor shall have a minimum clearance of ______ from
the ground. - ANSWER-6 inches
M1305.1.4.1
IMC/Residential
Excavations for appliance installations shall extend a minimum depth of ______ below
the appliance with a minimum clearance of ______ on all sides except the control side. -
ANSWER-6 inches, 12 inches
M1305.1.4.2
IMC/Residential
Where ventilated air space is used to reduce the required clearance between an
appliance and unprotected combustible materials, what is the minimum air space that is
typically required? - ANSWER-1 inch
M1306.2
IMC/Residential
An appliance requires a minimum clearance without protection of 12 inches above the
appliance to combustible material. If 1/2-inch-thick insulation board with ventilated air
space is used as protection, the minimum clearance may be reduced to ______. -
ANSWER-6 inches
M1306.2
IMC/Residential
A solid-fuel-burning appliance requires a minimum clearance without protection of 18
inches from the side and back to combustible material. If 24 gage sheet metal with a
ventilated air space is used as protection, the minimum clearance may be reduced to
______. - ANSWER-12 inches
M1306.2.1 Table M1306.2
IMC/Residential
Where an appliance with an ignition source is located in the garage, the source of
ignition shall be located a minimum of ______ above the garage floor. - ANSWER-18
inches
M1307.3
IMC/Residential
A combustion air opening for a central furnace shall be unobstructed for a minimum
distance of ______ in front of the opening. - ANSWER-6 inches
M1402.3
, IMC/Residential
The unobstructed total area of the outside and return air ducts or openings to a heat
pump shall be a minimum of ______ square inches per 1,000 Btu/h output rating or as
indicated by the conditions of the listing of the heatpump. - ANSWER-6
M1403.1
IMC/Residential
In order to permit the free drainage of defrost water, the supports or foundation for the
outdoor unit of a heat pump shall be raised a minimum of ______ above the ground. -
ANSWER-3 inches
M1403.2
IMC/Residential
What is the maximum permitted operating temperature for a radiant heating system
used on a gypsum assembly? - ANSWER-125* F
M1406.5
IMC/Residential
Unless Listed and labeled for closer installation, a duct heater shall be located a
minimum of ______ from a heat pump or air conditioner. - ANSWER-48 inches
M1407.3
IMC/Residential
The furnace register of a vented floor furnace shall be located a minimum of ______
from doors in any position, draperies and other similar combustible objects. - ANSWER-
12 inches
M1408.3 # 3
IMC/Residential
The access open through the foundation wall to a vented floor furnace shall have a
minimum size of ______. - ANSWER-18-inches by 24-inches
M1408.4
IMC/Residential
Where the lower 6 inches of a vented floor furnace is sealed to prevent water entry, a
minimum ______ clearance shall be provided between the furnace and the ground. -
ANSWER-2-inch
M1408.5 #3
Mechanical Code Master Set Exam
Questions with Correct Answers
IMC/Residential
In order for someone to service an appliance other than a room heater, a minimum
working space of______ inches deep by 30 inches wide shall be provided in front of the
control side of the appliance. - ANSWER-30
M1305.1
IMC/Residential
For the purpose of providing working space, a furnace or air handler located within a
closet or similar compartment shall be provided with a minimum of ______ clearance
along the sides, back and top of the appliance, with the total width of the enclosing
space a minimum of ______wider than the furnace. - ANSWER-3 inches, 12 inches
M1305.1.1
IMC/Residential
A minimum ______ working space shall be provided along the front combustion
chamber side of a central furnace having a firebox open to the atmosphere. - ANSWER-
6-inch
M1305.1.1
IMC/Residential
Where an appliance is installed in a compartment accessed by a passageway, the
passageway shall have a minimum unobstructed width of ______, but not less tham
necessary to allow removal of the largest appliance in the space. - ANSWER-24 inches
M1305.1.2
IMC/Residential
Where an appliance is installed in an attic, the clear access opening shall be a minimum
of ______, but in no case less than necessary to allow removal of the largest appliance.
- ANSWER-20-inches by 30-inches
M1305.1.3
IMC/Residential
,Appliances suspended from the floor shall have a minimum clearance of ______ from
the ground. - ANSWER-6 inches
M1305.1.4.1
IMC/Residential
Excavations for appliance installations shall extend a minimum depth of ______ below
the appliance with a minimum clearance of ______ on all sides except the control side. -
ANSWER-6 inches, 12 inches
M1305.1.4.2
IMC/Residential
Where ventilated air space is used to reduce the required clearance between an
appliance and unprotected combustible materials, what is the minimum air space that is
typically required? - ANSWER-1 inch
M1306.2
IMC/Residential
An appliance requires a minimum clearance without protection of 12 inches above the
appliance to combustible material. If 1/2-inch-thick insulation board with ventilated air
space is used as protection, the minimum clearance may be reduced to ______. -
ANSWER-6 inches
M1306.2
IMC/Residential
A solid-fuel-burning appliance requires a minimum clearance without protection of 18
inches from the side and back to combustible material. If 24 gage sheet metal with a
ventilated air space is used as protection, the minimum clearance may be reduced to
______. - ANSWER-12 inches
M1306.2.1 Table M1306.2
IMC/Residential
Where an appliance with an ignition source is located in the garage, the source of
ignition shall be located a minimum of ______ above the garage floor. - ANSWER-18
inches
M1307.3
IMC/Residential
A combustion air opening for a central furnace shall be unobstructed for a minimum
distance of ______ in front of the opening. - ANSWER-6 inches
M1402.3
, IMC/Residential
The unobstructed total area of the outside and return air ducts or openings to a heat
pump shall be a minimum of ______ square inches per 1,000 Btu/h output rating or as
indicated by the conditions of the listing of the heatpump. - ANSWER-6
M1403.1
IMC/Residential
In order to permit the free drainage of defrost water, the supports or foundation for the
outdoor unit of a heat pump shall be raised a minimum of ______ above the ground. -
ANSWER-3 inches
M1403.2
IMC/Residential
What is the maximum permitted operating temperature for a radiant heating system
used on a gypsum assembly? - ANSWER-125* F
M1406.5
IMC/Residential
Unless Listed and labeled for closer installation, a duct heater shall be located a
minimum of ______ from a heat pump or air conditioner. - ANSWER-48 inches
M1407.3
IMC/Residential
The furnace register of a vented floor furnace shall be located a minimum of ______
from doors in any position, draperies and other similar combustible objects. - ANSWER-
12 inches
M1408.3 # 3
IMC/Residential
The access open through the foundation wall to a vented floor furnace shall have a
minimum size of ______. - ANSWER-18-inches by 24-inches
M1408.4
IMC/Residential
Where the lower 6 inches of a vented floor furnace is sealed to prevent water entry, a
minimum ______ clearance shall be provided between the furnace and the ground. -
ANSWER-2-inch
M1408.5 #3
