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Air Distribution — Texas ACR A Practice Questions

36 questions · 15% of the Texas ACR A exam

Worked questions

1. Which approach addresses both cooking-emission capture and replacement air in a commercial kitchen ventilation design?

  • AUse a general room fan without capture at the cooking equipment.
  • BInstall a high-capacity exhaust hood without considering replacement air.
  • CRely only on opening windows when smoke is visible.
  • Coordinate the cooking hood and exhaust system with adequate makeup air.

Where to look it up

https://www.iccsafe.org/building-safety-journal/bsj-technical/exhaust-systems-and-makeup-air-achieving-balance-under-the-2024-international-mechanical-code/

Why D is correct

The hood, exhaust and makeup air must work together. A hood captures cooking emissions, while replacement air supports exhaust performance and limits excessive negative pressure. A hood is part of the solution, not inherently insufficient; its performance depends on the overall design.

2. Under the minimum openable-area rule in 2024 IMC Section 402.2, how much area openable to the outdoors is required per 100 square feet of floor area being naturally ventilated?

  • A1 square foot per 100 square feet of floor area
  • B2 square feet per 100 square feet of floor area
  • C3 square feet per 100 square feet of floor area
  • 4 square feet per 100 square feet of floor area

Where to look it up

https://www.iccsafe.org/building-safety-journal/bsj-technical/code-corner-2024-international-mechanical-code-chapter-4-ventilation/

Why D is correct

Section 402.2 specifies an openable area of 4% of the floor area being ventilated. For 100 square feet, 100 × 0.04 = 4 square feet. Each smaller listed area falls below this ratio. This question concerns that model-code provision, not a determination of local adoption or complete building compliance.

4. A healthcare air-filter maintenance procedure requires replacement at the manufacturer’s final pressure-drop limit or when inspection identifies damage. A filter reaches that limit before its calendar reminder. What should happen?

  • AWait for six months because MERV 13 always has that interval.
  • BIgnore pressure drop if the filter looks clean.
  • Replace it under the specified condition-based procedure rather than waiting for the reminder.
  • DTreat MERV rating as a measure of remaining service life.

Where to look it up

https://www.cdc.gov/infection-control/hcp/environmental-control/air.html

Why C is correct

The supplied procedure identifies the trigger. A filtration rating does not establish a universal replacement interval. CDC discusses maintenance, inspection and manufacturer-related performance criteria; this is not a quotation of a six-month IMC rule.

5. A technician needs to measure the actual volumetric airflow delivered through a supply diffuser. A suitable calibrated capture hood can completely cover the opening. Which method directly measures that airflow?

  • AInspect the diffuser visually without taking measurements.
  • BUse only the pressure drop predicted in the design documents.
  • Measure with the capture hood, following its manufacturer instructions.
  • DAssume the installed airflow equals the design airflow.

Where to look it up

https://19january2017snapshot.epa.gov/indoor-air-quality-iaq/iaq-building-education-and-assessment-model-ibeam-diagnosing-and-solving_.html

Why C is correct

A capture hood measures airflow through the opening it covers. Follow the instrument instructions and account for its measurement limitations. Visual inspection and design calculations alone do not measure the installed airflow. A single diffuser reading also does not map air movement throughout the room.

31 more in the bank

Answers and explanations for these are in the app.

  • A commercial building in Texas is required to have a continuous air exchange rate of 0.5 air changes per hour. Which of the following methods would be the most effective in achieving this requirement?
  • A new restaurant in Texas is being designed with a ventilation system. What is the minimum outdoor air supply required per person in dining areas, according to the 2024 IFGC?
  • A public building in Texas is being retrofitted with a new air distribution system. What type of system is typically used for high-rise buildings to ensure efficient air distribution?
  • A residential building in Texas is being designed with a forced-air heating and cooling system. According to the 2024 IMC, what is the minimum supply air temperature that can be used for heating without causing condensation on the coil surfaces?
  • A residential building in Texas is designed with a central air distribution system. The air handler is located in the attic. What is the minimum required vent area for the air handler to prevent backdrafting?
  • A residential building in Texas is equipped with a central air distribution system. The system is designed to deliver conditioned air to all habitable rooms. Which of the following locations is the most appropriate for the return air grill in this scenario?
  • A retail store in Texas is considering upgrading its air distribution system to improve energy efficiency. According to the 2024 IFGC, what is the minimum efficiency required for air handlers in retail stores?
  • A school building in Texas is being renovated to improve its air distribution system. According to the 2024 IFGC, what is the minimum number of supply and return air outlets required per 100 square feet of floor area?
  • A school building in Texas is undergoing an HVAC upgrade. What is the minimum airflow rate required per person in classrooms, according to the 2024 IMC?
  • A Texas Environmental Air Class A contractor is conducting an air quality inspection in a public building. Which of the following is a common indicator of poor indoor air quality, according to Modern Refrigeration and Air Conditioning 22nd ed.?
  • A Texas Environmental Air Class A contractor is inspecting a refrigeration system in a supermarket. What is the maximum allowable refrigerant leak rate, according to the 2024 IMC?
  • A Texas Environmental Air Class A contractor is installing a new air distribution system in a residential building. The system includes a supply air duct that passes through a crawl space. What is the minimum clearance required between the duct and the floor of the crawl space according to the 2024 IMC?
  • A Texas Environmental Air Class A contractor is installing air filters in an industrial facility. The facility has a dust-laden environment. What is the minimum efficiency rating required for the air filters, according to the 2024 UMC?
  • A Texas Environmental Air Class A contractor is installing an air conditioning unit in an office building. The unit is located on the roof. What is the minimum vertical clearance required between the unit and the roof edge, according to the 2024 IMC?
  • A Texas Environmental Air Class A contractor is responsible for insulating the air ducts in a school building. What is the minimum R-value required for the duct insulation, according to the 2024 IMC?
  • A Texas residential building has a crawl space that is used for air distribution. How should the air distribution system be designed to prevent moisture accumulation in the crawl space?
  • A warehouse in Texas needs to ensure proper airflow in its ventilation system. According to the 2024 UMC, what is the minimum accuracy required for airflow measurement devices?
  • According to the 2024 UMC, what is the maximum temperature difference between the air entering and leaving an air-cooled condenser unit?
  • An industrial facility in Texas is installing new air ducts. According to the 2024 UMC, what is the minimum R-value of insulation required for ducts conveying air at 180°F?
  • An industrial facility in Texas is upgrading its air filtration system. The current system uses a baghouse filter. Which type of filter is most likely to be used as a pre-filter in this upgrade?
  • An industrial facility in Texas uses a dust collector that requires regular maintenance. Which type of air filter should be used to prevent the build-up of dust on the collector's components?
  • An industrial facility in Texas uses a high-pressure air distribution system. What is the maximum allowable pressure drop across the system, according to the 2024 UMC?
  • In a commercial building, a Texas Environmental Air Class A contractor is designing a ventilation system. The system must provide 100% outdoor air. What is the minimum outdoor air ventilation rate required per person, according to the 2024 IFGC?
  • In a commercial building in Texas, the 2024 IFGC requires a minimum of 0.35 air changes per hour for ventilation. If the building has a volume of 100,000 cubic feet, what is the minimum outdoor air supply required?
  • In a healthcare facility, what is the recommended frequency for replacing the air filters in the HVAC system?
  • In a hospital, a Texas Environmental Air Class A contractor is verifying the airflow in a critical care room. What is the recommended method for measuring airflow, according to the ACCA Manual D?
  • In a public building in Texas, a new air handling unit is being installed. The engineer has specified a minimum airflow rate of 100 cfm per person. Which of the following statements about airflow is true?
  • In a public building in Texas, the air distribution system is being inspected. The inspector notes that the airflow in one of the rooms is significantly lower than the design specifications. Which of the following steps should the inspector take next?
  • In an office building, what is the recommended relative humidity level for maintaining good indoor air quality?
  • What is the minimum amount of outdoor air that must be supplied to each occupant of a residential building according to the 2024 IMC Section 403.2?
  • Which of the following is a correct application of a relief vent on an exhaust air system?

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