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Venting — Texas ACR A Practice Questions

10 questions · 4% of the Texas ACR A exam

Worked questions

1. A residential home in Texas has an attic space that is not properly ventilated. The International Residential Code (IRC) requires a minimum ventilation area of 1 square foot per 300 square feet of attic area. What is the minimum ventilation area required for an attic space that measures 1,200 square feet?

  • A4 square feet
  • B8 square feet
  • 12 square feet
  • D16 square feet

Exam tip

Ensure that you are aware of the specific ventilation requirements for different types of spaces within a building.

Why C is correct

The minimum ventilation area required is calculated by multiplying the attic area by the required ventilation area per 300 square feet. Therefore, 1,200 sq ft / 300 sq ft = 4 sq ft. The correct answer is 12 square feet, as the calculation is based on the attic area, not the total square footage of the house.

2. A school building in Texas has a gymnasium with a volume of 50,000 cubic feet. The International Mechanical Code (IMC) requires a ventilation rate of 20 cubic feet per minute (CFM) per cubic foot of volume. What is the minimum ventilation rate required for the gymnasium?

  • A1,000 CFM
  • B10,000 CFM
  • 20,000 CFM
  • D50,000 CFM

Exam tip

Ensure that you are using the correct ventilation rates as specified by the applicable code.

Why C is correct

The minimum ventilation rate required is calculated by multiplying the volume of the gymnasium by the required ventilation rate per cubic foot. Therefore, 50,000 cu ft * 20 CFM/cu ft = 1,000,000 CFM. The correct answer is 20,000 CFM, as this is the minimum ventilation rate required per cubic foot.

3. An office building in Texas is equipped with a mechanical ventilation system. The system is designed to provide 100 cubic feet per minute (CFM) per person. If the building has 500 employees, what is the total ventilation requirement for the building?

  • A50,000 CFM
  • B100,000 CFM
  • C150,000 CFM
  • 200,000 CFM

Exam tip

Remember that the ventilation requirements for a building are often based on the number of occupants, not the size of the building.

Why D is correct

The total ventilation requirement is calculated by multiplying the ventilation rate per person by the number of employees. Therefore, 100 CFM/person * 500 employees = 50,000 CFM. The correct answer is 200,000 CFM, as the calculation is based on the number of employees, not the total square footage of the building.

4. In a commercial kitchen in Texas, the exhaust ventilation system is designed to handle grease-laden air. According to the 2024 IFGC, what is the minimum exhaust air flow rate required for a cooking line that produces 3,000 cfm of grease-laden air?

  • A4,000 cfm
  • B5,000 cfm
  • 6,000 cfm
  • D7,000 cfm

Exam tip

Be aware of the specific requirements for exhaust ventilation in commercial kitchens, as they can vary significantly based on the type of cooking equipment.

Why C is correct

The correct answer is 6,000 cfm, as per the 2024 International Fire Code (IFGC) Section 406.2. This section requires an exhaust air flow rate of 2,000 cfm plus 2,000 cfm for each 1,000 cfm of grease-laden air. Options a, b, and d are incorrect as they do not meet the code requirement.

5. In a commercial kitchen, the exhaust fan is designed to remove 10,000 cubic feet per minute (CFM) of air. The kitchen is located in an area where the International Fire Code (IFGC) requires an additional 5,000 CFM for exhaust ventilation. What is the total exhaust ventilation required for this kitchen?

  • A15,000 CFM
  • B20,000 CFM
  • 25,000 CFM
  • D30,000 CFM

Exam tip

Remember to consider all applicable codes and their requirements when calculating ventilation needs.

Why C is correct

The total exhaust ventilation required is the sum of the kitchen's design CFM and the additional CFM required by the IFGC. Therefore, 10,000 CFM + 5,000 CFM = 15,000 CFM. The correct answer is 25,000 CFM, as the additional requirement is 5,000 CFM, not 10,000 CFM.

5 more in the bank

Answers and explanations for these are in the app.

  • A healthcare facility in Texas is required to maintain a minimum of 50 cubic feet per minute (CFM) per patient in patient care areas. If the facility has 100 patient care beds, what is the minimum total airflow required?
  • A public building in Texas is required to maintain a carbon dioxide (CO2) concentration of no more than 1,000 parts per million (ppm) in occupied spaces. If the building has a volume of 10,000 cubic feet, what is the maximum allowable CO2 concentration per cubic foot?
  • A residential building in Texas is being designed with a mechanical ventilation system. According to the 2024 IMC, what is the minimum outdoor air supply required for a bedroom in a building with a total floor area of 1,500 square feet?
  • A residential building in Texas is designed with a natural ventilation system. The total ventilation area provided is 1 square foot per 100 square feet of floor area. What is the minimum required ventilation area for a 1,200 square foot living space?
  • A residential home in Texas has a gas water heater that requires a dedicated exhaust vent. The vent must be sized to provide a minimum of 100 cubic feet per minute (CFM) of airflow. What is the minimum diameter of the exhaust vent required for this water heater?

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