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National Standard Residential Mechanical

ICC Exam Workbook Sample Questions

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97. For mechanical draft systems, except for direct vent appliances, the bottom of the vent terminal must be located at least ____________________ above finished ground level.

A. 12 inches
B. 3 feet
C. 10 feet
D. 12 feet

98. For fuel gas appliances, when combining spaces the volumes of spaces in different stories for purposes of combustion air requirements will be considered as communicating spaces where such spaces are connected by one or more openings in doors or floors having a total minimum free area of ___________________________ of total input rating of all appliances.

A. 2 square inches per 1,000 Btu/h
B. 4 square inches per 1,000 Btu/h
C. 6 square inches per 1,000 Btu/h
D. 8 square inches per 1,000 Btu/h

99. Vent piping for an oil tank must terminate outside of buildings at a point not less than _______________, measured vertically or horizontally, from any building opening.

A. 10 feet
B. 12 feet
C. 5 feet
D. 2 feet

100. Above-ground duct systems may use gypsum products to construct return air ducts or plenums is permitted, provided that the air temperature does not exceed _____________________ and exposed surfaces are not subject to condensation.

A. 212°F
B. 150°F
C. 250°F
D. 125°F

101. The vent pipe on an oil tank shall be not smaller than ___________ pipe.

A. 3/8-inch
B. 3/4-inch
C. 1/2-inch
D. 11/4-inch

102. The minimum thickness of galvanized round ducts and enclosed rectangular ducts and plenums of 14 inches or less in diameter, 1/2 inch water gage static pressure used for heating or cooling, is _______________ inches.

A. 0.0157
B. 0.016
C. 0.019
D. 0.013

103. An auxiliary drain pan must have a minimum depth of ________________,must not be less than ________________ larger than the unit or the coil dimensions in width and length and must be constructed of corrosion-resistant material.

A. 1.5 inches, 4 inches
B. 1.5 inches, 6 inches
C. 1.5 inches, 3 inches
D. 3 inches, 3 inches

104. Outdoor and return air for a forced-air heating or cooling system may not be taken from a _______________ or unconditioned attic. Exceptions ignored.

A. closet
B. bathroom or toilet room
C. kitchen
D. garage, mechanical room or furnace room
E. any of the above

105. In Indoor locations intended for hydrogen-generating or refueling operations, where ducts are used for ventilation, they shall be of the same cross-sectional area as the free area of the openings to which they connect and in those locations, equipment and appliances having an ignition source must be located so that the source of ignition is not within ____________________ of the ceiling.

A. 6 inches
B. 18 inches
C. 4 inches
D. 12 inches

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

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

107. With reference to electric duct heaters, the fan circuit must be provided with ____________ to prevent heater operation when the fan is not operating.

A. a thermostat
B. an interlock
C. a cutoff valve
D. none of the above

108. A 35,000 Btu per hour water heater is to be common vented with a 150,000 Btu per hour furnace using a common vent with a total height of 30 feet. The connector rise is 2 feet for the water heater with a horizontal length of 4 feet. The connector rise for the furnace is 3 feet with a horizontal length of 8 feet. Assume single-wall metal connectors will be used with Type B vent. What minimum size connectors and combined vent should be used in this installation?

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

109. Above-ground duct systems must be designed to limit discharge air temperature to a maximum of ___________.

A. 125°F
B. 150°F
C. 250°F
D. none of the above

110. Vibration isolators installed between mechanical equipment and metal ducts shall be fabricated from approved materials and may not exceed ______________________ in length.

A. 24 inches
B. 10 inches
C. 6 inches
D. 5 feet

111. Dryer exhaust systems must be independent of all other systems and must convey the moisture____________________. Exceptions ignored.

A. to the outdoors
B. to a point above the roofline
C. no farther than within 3 feet of the clothes dryer
D. a point higher than the dryer outlet

112. For fuel gas appliances, rooms ________________ in which the appliances are installed through openings not furnished with doors, and through combustion air openings sized and located in accordance with the code are considered to be part of the required volume of combustion air.

A. sealed off from direct contact with the space
B. of over 1000 sq. ft. is size
C. communicating directly with the space
D. none of these

113. Underground oil tanks must have a minimum clearance from the tank to the nearest wall of a basement, pit or property line of not less than ______________.

A. 1 foot
B. 18 inches
C. 2 feet
D. 10 feet

114. Are domestic gas ranges in single and two family dwellings required to be vented?

A. Yes
B. No

115. The duct serving a range hood shall have a smooth interior surface, shall be __________ and shall be equipped with a backdraft damper.

A. air tight
B. water tight
C. round
D. all of the above

116. Auxiliary and secondary drain pan piping must be a minimum of ____________________ nominal pipe size.

A. 1/2-inch
B. 1-inch
C. 3/4-inch
D. 1/4-inch

117. Underground oil tanks shall be covered with not less than _________________ of earth.

A. 1 foot
B. 18 inches
C. 2 feet
D. 5 feet

118. Oil tanks installed outdoors above ground must be a minimum of _____________ from an adjoining property line.

A. 5 feet
B. 3 feet
C. 10 feet
D. 12 feet

119. For an appliance installed in an attic, if the access passageway is unobstructed and not less than 6 feet high and 22 inches wide for its entire length, the passageway may be not more than ________________________ long.

A. 20 feet
B. 30 feet
C. 40 feet
D. 50 feet

120. A duct extending from the furnace supply outlet must not extend to less than __________________ below the combustible framing.

A. 3 inches
B. 4 inches
C. 6 inches
D. 12 inches

121. The chimney and vent connector clearances to combustible materials for Type L vent piping connectors with oil and solid-fuel appliances are ___________________.

A. 9 inches
B. 12 inches
C. 18 inches
D. 24 inches

122. 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 gallons
B. 3.0 gallons
C. 4.5 gallons
D. 6.0 gallons

123. Section G2401 Fuel Gas regulates liquefied natural gas (LNG) installations.


124. In floor heating systems, cross-linked polyethylene (PEX) tubing joints that are embedded concrete or gypsum shall be joined using _______________________________.

A. socket-type heat-fused polypropylene fittings
B. polybutylene pipe cement
C. cold expansion, insert or compression fittings
D. solvent cement joints

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

A. 2 feet
B. 3 feet
C. 5 feet
D. 6 feet

126. Underfloor spaces containing appliances requiring access must have an unobstructed passageway large enough to remove the largest appliance, but not less than _________________________________ , nor more than ________________ when measured along the centerline of the passageway from the opening to the appliance. Exceptions ignored.

A. 30 inches high and 22 inches wide, 20 long
B. 30 inches high and 22 inches wide, 30 long
C. 30 inches high and 22 inches wide,40 long
D. 30 inches high and 22 inches wide, 50 long

127. A luminaire controlled by a switch located at the required passageway opening and _____________________ must be installed at or near the appliance location in accordance with the electrical section Chapter 39 of the code.

A. warning label
B. service manual
C. installation manual
D. a receptacle outlet

128. Equipment installed outdoors must be supported to prevent _____________________________ of the equipment.

A. excessive vibration
B. settlement
C. movement
D. theft of the equipment
E. all of the above except D

129. Vent and chimney connectors shall be installed in accordance with the manufacturer’s installation instructions and within the space where the appliance is located and the appliances must be located ________________________________.

A. within 5 feet of the vent or chimney
B. within 50 feet of the vent or chimney
C. within 6 inches of the vent or chimney
D. as close as practical to the vent or chimney

130. The lower end of a vent pipe on an oil tank shall enter the tank through the top and shall extend into the tank not more than ___________.

A. 3/8-inch
B. 3/4-inch
C. 1 inch
D. 11/4-inch

131. The chimney and vent connector clearances to combustible materials for oil appliances listed for use with Type L vents is ___________________.

A. 9 inches
B. 12 inches
C. 18 inches
D. 24 inches

132. In Seismic Design Categories D1 and D2, where water heaters must be anchored or strapped to resist horizontal displacement caused by earthquake motion, at the lower point, the strapping shall maintain a minimum distance of __________________________ above the controls.

A. 2 inches
B. 4 inches
C. 8 inches
D. 12 inches

133. Stud wall cavities and the spaces between solid floor joists to be used as air plenums may not be ____________________.

A. used as a plenum for supply air.
B. part of a required fire-resistance-rated assembly.
C. to convey air from more than one floor level.
D. isolated from adjacent concealed spaces by tight-fitting fire blocking in accordance with Section R602.8.
E. all of the above

134. The AC piping and fittings for refrigerant vapor (suction) lines must be insulated with insulation having a thermal resistively of at least __________.

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

135. In floor heating systems, polybutylene pipe and tubing joints that are embedded concrete or gypsum shall be connected with ___________________________.

A. socket-type heat-fused polybutylene fittings
B. polybutylene pipe cement
C. compression connectors
D. none of the above

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