International Mechanical Code (IMC) Practice Test

These questions are part of the practice quiz. Start practicing

• What is the purpose of providing a mechanical exhaust in smoking lounges?
• What characteristic defines a high heat appliance?
• What is the minimum thickness of plastic sheathing required to prevent direct contact between copper piping and concrete?
• What classifications describe the location of refrigerating systems in terms of potential exposure to refrigerants?
• What is the maximum amount of refrigerant in pounds that listed equipment and appliances can have without requiring a machinery room?
• According to IMC standards, what must appliances be in terms of safety?
• What must attics containing appliances have to facilitate the removal of the largest appliance?
• The thermal break required for radiant floor heating systems must be installed in what manner?
• What is the purpose of providing guards around appliances and equipment on rooftops?
• The mechanical exhaust rate for uninhabited spaces should not fall below what value per square foot of horizontal area?
• Which type of exhaust systems are permitted to discharge to a common hazardous exhaust shaft?
• How often must copper-alloy tubing be supported when installed horizontally?
• In mechanical ventilation supply systems, the required rate of outdoor air flow must be directed to which area within each occupiable space?
• In which type of walls are stud wall cavities prohibited from being used as air plenums?
• How far must exhaust from mechanical ventilation systems serving machinery rooms be discharged from a property line?
• What must be done with exterior above-grade fill piping for fuel oil systems when tanks are abandoned?
• Which of the following is a requirement for vent termination above walkways?
• What is an 'offset' in mechanical terms?
• What temperature should be maintained or less for the potable hot water distribution system in a combined heating system?
• In emergencies, what authority does the code official have regarding utility service?
• What is the maximum number of extensions for an unexpired permit that may be granted for reasonable cause?
• Why is it important to provide accessible HVAC components?
• What must be preserved when defective material or parts are replaced or repaired?
• What is required to activate the exhaust fan serving a Type I hood?
• What is the minimum thickness for galvanized steel vent connectors?
• Which standard must tapes and mastics used to seal metallic flexible air ducts comply with?
• What protection is required for existing refrigerant access ports located outdoors when refrigerant is added?
• For parking garages, the code mandates automatic operation of ventilation systems by using which type of detectors?
• For underfloor spaces containing appliances, what is the minimum size of the access opening?
• Each day a code violation continues is considered what type of offense?
• What is a characteristic of a low heat appliance?
• To prevent fire hazards, how should chimney inlet openings be sealed?
• What is the maximum allowable temperature differential between makeup air and the air in the conditioned space in a commercial kitchen?
• What type of exhaust system is specifically mentioned for use in commercial settings?
• What must be in place for a final inspection to occur in a mechanical system?
• What do the provisions of the code prioritize in case of conflicting requirements?
• What must be provided for equipment and appliances containing evaporators or cooling coils?
• How far away should air intake openings be from contaminant sources located within 10 feet?
• What is the primary purpose of a duct in an HVAC system?
• For appliances in private garages and carports, what is the minimum clearance above the floor?
• What is necessary for machinery rooms concerning their ventilation system?
• How should every occupied space be ventilated?
• On what type of construction should boilers be mounted?
• What must be supplied to solid fuel-burning appliances for optimal operation?
• What is the maximum smoke-developed index for materials exposed to airflow in plenum construction?
• What additional support is necessary when copper piping is installed in concrete?
• When multiple fuel-oil-burning appliances are connected, what is a critical component in the fuel oil piping setup?
• What is the minimum internal diameter for a condensate waste drain line?
• According to which code must requirements for combustion and dilution air for gas-fired appliances be followed?
• The amount of supply air required in a ventilation system should be approximately equal to which of the following?
• At what distance from roof edges must guards be provided for appliances that require servicing?
• Which appliance type is characterized by combustion products entering the flue at temperatures more than 1,000°F but not exceeding 2,000°F?
• Which component of a hydronic piping system can lead to water hammer if not properly controlled?
• What is the maximum width for a dryer exhaust duct to qualify under standard specifications?
• What protection do authorized employees have when enforcing this code in good faith?
• What is required for refrigerant piping systems containing more than 100 pounds of refrigerant?
• What should the condensate drain line not decrease in size from?
• What should condensate not discharge into, to avoid causing a nuisance?
• How long shall domestic clothes dryer transition ducts be limited to when connecting the dryer to the exhaust duct system?
• How must the code official respond if a proposed alternative material does not comply with the code?
• In the context of the IMC, what does “disconnection” typically refer to?
• What must each pipe and tubing in a mechanical system display?
• How many sheet metal screws or rivets are required to mechanically fasten round metallic ducts?
• How many commercial kitchen hood types are defined in the IMC Chapter 2?
• What must be provided if a proposed alternative method is not approved?
• Which component is essential for identifying parts used in a mechanical system?
• During which type of inspection are all framing and fireblocking components evaluated?
• When there is a conflict between provisions of the IMC and referenced standards, which provisions shall apply?
• In smoke control systems, all wiring must be enclosed within continuous what?
• Which areas are prohibited from being used as return air sources?
• What type of power should smoke control systems be supplied with?
• What is the required flash point of the heat transfer fluid in a solar system relative to the design maximum non-operating temperature?
• Which action is not included as a requirement for appliance accessibility?
• What is the minimum clearance to combustible materials for a pipe in a hydronic piping system when the exterior temperature exceeds 250°F?
• Vented wall furnaces must be located how far from an air inlet?
• The clearance to combustibles for a hydronic pipe with high exterior temperatures is set to avoid what?
• The ventilation rates provided in the code are based on the absence of which of the following in occupiable spaces?
• Ground-source heat pump ground-loop system piping must be marked where the piping does what?
• What type of caps are required for outdoor refrigerant access ports in general?
• What does the term “air condition” refer to in the context of mechanical systems?
• Which type of valve is required for the protection of steam boilers?
• Which of the following must hydronic pipe insulation's R-value mark be?
• Ignition sources in hazardous locations must be elevated a minimum of what height above the floor?
• What indoor temperature must active or passive space-heating systems maintain?
• How far must the fill pipe for fuel oil systems terminate from any building opening at the same or lower level?
• What is the minimum size of openings for protective screens at ventilation air intake in residential occupancies?
• How should the required insulation shield be secured?
• What must be ensured if a gasketed fireplace door is used with a factory-built fireplace?
• When should underground inspections be made according to the code?
• What type of relief device must all pressure vessels be equipped with?
• A system that includes heat exchangers and ducts is known as what?
• A floor furnace has a minimum distance restriction from the nearest wall. What is that distance?
• What is a potential consequence of improper condensate disposal?
• How are the ventilation rates for occupiable spaces affected in cases of smoking?
• In refrigerating systems, what degree of probability is assessed regarding the leakage of refrigerants?
• What type of appliance is designed specifically to dry wet laundry?
• An unvented gas log heater shall not be installed in what type of fireplace?
• Mechanical systems are prohibited from being located in which type of shaft?
• What is the purpose of a vent termination?
• What should be avoided around a floor furnace to keep it compliant with safety regulations?
• What is the minimum allowed height for ignition sources located in public garages?
• An appliance must be designed for use with which type of fuel?
• What is a chimney primarily used for?
• What is the primary goal of air conditioning in a conditioned space?
• The provisions of the code are mandatory for which type of buildings?
• What is the function of a fire damper?
• What dimension is used as a standard for nominal pipe size in a fuel oil system supply line?
• A valve that requires a one-quarter round turn or less is categorized as what type of opening?
• What is the purpose of the shutoff valve in a fuel-oil piping system?
• Where should refrigerant circuit access ports located outdoors be fitted?
• What must solid fuel-burning appliances comply with for combustion air requirements?
• The minimum outdoor airflow required for each zone is determined by which classification?
• On roofs with a slope of 3:12 or greater, what is required for service access?
• Which of the following best defines 'living space' in a dwelling unit?
• What material should hangers and brackets for suspended-type unit heaters be made from?
• What is one main concern for the placement of fill pipes in fuel oil installations?
• Where should the manual shut-off valve for a vented wall furnace be installed?
• When refrigerant is added, what must occur to existing outdoor access ports?
• What is the correct definition of clearance in mechanical installations?
• In addition to the distance from the wall, how far from a door can a vented wall furnace be installed?
• What is the term for an assembly of connected components through which air is conducted and exhausted?
• Which material can be used as a vent connector?
• What happens to permits if the work authorized is not commenced within 180 days of issuance?
• Where should air dispersion systems be installed in a building?
• What is meant by the term 'interpretations' in the context of the IMC?
• What is considered "return air"?
• In which section are general definitions for appliance types found?
• Which component is essential for maintaining air quality in a mechanical ventilation system?
• Which of the following is not a prohibited location for return air?
• What is the minimum slope required for underground ducts to allow for drainage?
• What is the minimum amount of refrigerant in a piping system that requires stop valves on each inlet of each liquid receiver?
• What type of dampers are required in HVAC systems that automatically shut down during a fire?
• How far above the level of a walkway must the horizontal termination of mechanical draft systems be located?
• What should the flow velocity of a hydronic piping system be controlled to reduce the possibility of?
• What four actions must appliances and HVAC components be accessible for?
• Why is it important for the fill pipe to terminate outside of a building?
• Which of the following actions is prohibited for mechanical fasteners used to support commercial grease ducts?
• What are the minimum dimensions for clear access openings in attics containing appliances?
• What defines high heat appliances?
• What is the primary function of a boiler?
• What does the IMC require for the ventilation of buildings?
• What is the necessary condition for a rough-in inspection to be conducted?
• What is the term for the liquid that condenses from a gas due to a reduction in temperature?
• According to code, how should abandoned fuel oil tanks be handled?
• What is defined as the minimum distance through air between a heat-producing surface and combustible materials?
• Type I commercial kitchen exhaust hoods must be installed where cooking appliances produce which of the following?
• In case of conflict between a general requirement and a specific requirement, which requirement shall govern?
• What is the minimum height for plume discharged from cooling towers above any ventilation inlet to a building?
• Which term describes a location identified as a fire hazard due to flammable materials?
• What is the maximum temperature that sauna heaters are allowed to maintain?
• What is the significance of the 2-foot requirement for terminating fill and vent pipes?
• What is the minimum clearance required from the top of a boiler with manholes to the ceiling or overhead construction?
• Domestic cooking exhaust equipment shall discharge to the ________.
• How many inches above the adjoining grade must the support for equipment and appliances extend?
• What type of cutoff control should be used to protect steam and hot water boilers?
• What defines a vent that is connected to an appliance vented by natural draft?
• What requirements must appliances installed in locations other than indoor ones meet?
• Hydronic piping systems must be tested hydrostatically at one and one-half times the maximum design pressure, but not less than what psi?
• What type of exhaust is required in smoking lounges according to the code?
• How far must drapery or similar combustible objects be from any portion of the register of a floor furnace?
• How far above insulation materials must the required insulation shield terminate?
• How is the classification of refrigeration systems mainly determined?
• What is the maximum approved length for a transition duct between a dryer and exhaust duct?
• In a mechanical system, what defines 'labeled' equipment?
• Equipment installed at grade level must be supported on what type of material?
• What is the maximum distance for exhaust inlets from the point of chemical application at manicure tables?
• In designs for mechanical ventilation systems, what must be considered for outdoor air intake?
• A certificate of test is required for refrigeration systems containing how many pounds or more of refrigerant?
• What is the minimum required distance for liquid fuel vent pipes to terminate away from any building opening?
• What is the minimum width and height for an unobstructed passageway in rooms containing appliances?
• Under what condition are employees exempt from liability when enforcing the code?
• Mechanical makeup air for commercial kitchen exhaust systems must be controlled to operate in what manner?
• What type of systems is required for each interior space intended for human occupancy?
• What type of labeling is required for appliances installed outdoors?
• An appliance vented by natural draft should not connect to a vent chimney on what side of the mechanical flue exhauster?
• What is constituted by 'quick opening' valves?
• How far apart must cleanouts be located on horizontal sections of commercial grease ducts?
• Connecting areas such as offices and waiting rooms adjacent to a public parking garage must be maintained at what type of pressure?
• Which of the following describes the air-handling process?
• Which appliance is specifically meant for heating water or creating steam for various purposes?
• Which control feature is essential for sauna heaters as part of the safety regulations?
• Which construction does not allow the installation of air dispersion systems?
• What additional feature must be provided with radiant floor heating systems along with insulation?
• What must not be mixed in a refrigerant system?
• What must materials used in a hydronic piping system be rated for?
• What is the purpose of an exhaust system in mechanical construction?
• What does combustion air refer to?
• What is the maximum flame spread index allowed for materials exposed to airflow in plenum enclosure construction?
• What should be measured to ensure a properly functioning vent pipe in fuel systems?
• What does BTU stand for?
• How many feet above the highest point of roof penetration must Type L vents terminate?
• Appliance and equipment vent terminals must be located such that doors cannot swing within how many inches horizontally of the vent terminals?
• What is the approved method for closing abandoned inlet openings in chimneys and vents?
• What type of valve must be installed on fuel-oil piping where more than one fuel-oil-burning appliance is present?
• Which of the following best describes the status of historic buildings under the IMC?
• All single or combined mechanical exhaust systems must be __________ of all other exhaust systems.
• In areas frequented by motor vehicles, appliances must be installed a minimum of how many feet above the floor?
• What is the required distance a wall register model of a floor furnace should be from a corner?
• Exhaust discharge air shall not be exhausted into an _________ or crawl space.
• In what environment should exhaust air from cooking equipment not be directed?
• What is the minimum vertical height above the highest connected appliance flue collar that vents must terminate?
• Which clearance is necessary for appliances installed in public garages above the floor?
• How should appliances installed in rooms be accessed?
• What must determine the maximum length of a dryer exhaust duct exceeding 35 feet?
• Factory-built fireplace hearth extensions must be readily distinguishable from what?
• Which of the following locations is prohibited for fuel-fired appliances to obtain combustion air from?
• How high must an open-type expansion tank be located above the highest heating element?
• Dryer exhaust ducts shall not be joined with screws that protrude more than ________ inch into the inside of the duct.
• What is the minimum size of a supply line for fuel oil systems in terms of inside diameter nominal pipe?
• What authority does the code official have regarding the IMC?
• What is the required discharge location for air from mechanical exhaust systems?
• What is an acceptable method for fastening round metallic ducts?
• Which type of device can be used instead of a required guard for appliances installed on rooftops?
• A boiler installed in a closet must be what for such installation?
• What type of ventilation must machinery rooms have?
• What is the minimum horizontal distance that plume from cooling towers should be from any ventilation inlet?
• What type of appliance has combustion products entering the flue at a temperature of 1,000°F or less?
• Fuel-fired appliances should not be located in which type of rooms?
• Dryer exhaust ducts serving commercial clothes dryers shall have a minimum clearance of ________ inches to combustible materials.
• The size of a closed-type expansion tank should be based on what?
• The maximum length of a domestic dryer exhaust duct is __________ feet.
• Where is an automatic appliance shut-off device required for condensate pumps?
• What type of door is prohibited on a factory-built fireplace unless specifically tested and labeled for such use?
• What is a damper used for?
• What is the minimum vertical distance for air intake openings above streets and alleys?
• What does the Refrigeration Capacity Rating express?
• What type of valve must steam boilers be equipped with at the bottom?
• What conductor is required for the power supply to a boiler's electrical control system?
• What defines the mechanical ventilation system's performance in relation to occupancy?
• What is the nominal size diameter of domestic clothes dryer exhaust ducts?
• What is included in a duct system?
• What is the minimum distance required between protective assemblies and mechanical appliances?
• What is the minimum clearance required to combustible construction for commercial grease duct systems serving a Type I hood?
• The air removed by every mechanical exhaust system shall be discharged ________.
• What must refrigerant piping installed in concrete floors be encased in?
• What is the purpose of having an automatic shut-off device in condensate pumps?
• What is the process of supplying or removing air from a space referred to as?
• What is the procedure referred to for the removal of air from a conditioned space?
• Hydronic pipe insulation installed in buildings must conform to which code?
• Radiant heating panels must be installed as what type of units when not listed and labeled for field cutting?
• How does the flash point of the heat transfer fluid impact the overall safety of the solar system?
• How many persons must congregate in a large mercantile occupancy on levels above or below street level?