Venting — Texas ACR A Practice Questions

10 questions · 4% of the Texas ACR A exam

Worked questions

1. For a ventilation-area calculation, a design specifies 1 square foot of net free vent area per 300 square feet of attic area. An attic is 1,200 square feet. What net free vent area does this specified ratio require?

4 square feet
B8 square feet
C12 square feet
D16 square feet

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

Divide the attic area by the specified ratio denominator: 1,200 ÷ 300 = 4 square feet of net free vent area. This exercise does not establish whether the 1:300 ratio is permitted for a particular attic or how vents must be distributed.

2. A gym ventilation exercise specifies 50,000 ft³ of volume and a design target of 6 air changes per hour. What airflow corresponds to that target?

A300,000 cfm
B20,000 cfm
5,000 cfm
D833 cfm

Where to look it up

https://www.cdc.gov/niosh/ventilation/faq/index.html

Why C is correct

6 × 50,000 / 60 = 5,000 cfm. Volume must be converted using the hourly target and 60 minutes per hour; no universal cfm-per-cubic-foot requirement is implied.

3. For an arithmetic exercise, an office project specifies an airflow allowance of 100 cfm for each of 500 occupants. What total airflow does that stated allowance produce?

50,000 CFM
B100,000 CFM
C150,000 CFM
D200,000 CFM

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

100 cfm per occupant × 500 occupants = 50,000 cfm. This computes the stated project allowance; it does not establish a code ventilation minimum, which may use other inputs.

4. Three separate commercial-kitchen exhaust systems have specified simultaneous flows of 1,600, 2,100 and 2,300 cfm. What is their combined exhaust flow?

A4,400 cfm
B8,000 cfm
6,000 cfm
D2,300 cfm

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why C is correct

1,600 + 2,100 + 2,300 = 6,000 cfm. The flows are supplied for separate systems; this does not derive hood flow from an invented appliance-count formula.

5. A kitchen project specifies 10,000 cfm of exhaust. An approved design revision adds a separate 5,000 cfm exhaust load to that total. What is the revised total specified exhaust airflow?

15,000 CFM
B20,000 CFM
C25,000 CFM
D30,000 CFM

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why A is correct

The revised total is 10,000 + 5,000 = 15,000 cfm. The added load is an explicit project assumption, not a universal code requirement. Equipment selection and makeup-air design require separate review.

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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Venting — Texas ACR A Practice Questions

Worked questions

1. For a ventilation-area calculation, a design specifies 1 square foot of net free vent area per 300 square feet of attic area. An attic is 1,200 square feet. What net free vent area does this specified ratio require?

2. A gym ventilation exercise specifies 50,000 ft³ of volume and a design target of 6 air changes per hour. What airflow corresponds to that target?

3. For an arithmetic exercise, an office project specifies an airflow allowance of 100 cfm for each of 500 occupants. What total airflow does that stated allowance produce?

4. Three separate commercial-kitchen exhaust systems have specified simultaneous flows of 1,600, 2,100 and 2,300 cfm. What is their combined exhaust flow?

5. A kitchen project specifies 10,000 cfm of exhaust. An approved design revision adds a separate 5,000 cfm exhaust load to that total. What is the revised total specified exhaust airflow?

5 more in the bank

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