12 questions · 5% of the Texas ACR A exam
Where to look it up
https://www.cdc.gov/niosh/ventilation/faq/index.html
Why D is correct
ACH = 180 × 60 / 1,800 = 6. This is total supply air, not outdoor air, and is a calculation rather than a healthcare code minimum.
Where to look it up
https://www.tdlr.texas.gov/boilers/blrfaq.htm
Why C is correct
TDLR identifies a Boiler Installation Report due within 30 days of installation. The boiler must not be test-fired or operated until the required initial inspection passes or a temporary operating permit is approved. This does not replace applicable local permits or the separate requirements for repairs and alterations.
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why B is correct
The shortfall is 600 − 450 = 150 cfm. The target is supplied by this exercise; it is not inferred from furnace input or presented as a universal fuel-gas rule.
Where to look it up
https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/Carbon-Monoxide-Information-Center
Why B is correct
CO alarms warn of a hazard; they do not correct its source. Follow appliance installation and maintenance requirements as well as alarm instructions.
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why A is correct
The people component is 25 × 10 = 250 cfm; the area component is 1,000 × 0.12 = 120 cfm. Sum = 370 cfm. These are stated design inputs, not an asserted adopted-code rate.
Where to look it up
https://www.cpsc.gov/Safety-Education/Safety-Education-Centers/Carbon-Monoxide-Information-Center
Why B is correct
A previous inspection does not rule out a new fault. Potential CO exposure requires prompt safety action and qualified investigation, not an invented fixed Texas testing interval.
Where to look it up
Explicit exercise assumptions; not a universal code requirement.
Why B is correct
Available flow is 1,800 + 2,200 = 4,000 cfm; shortfall = 5,000 − 4,000 = 1,000 cfm. Actual fan interaction must be checked in commissioning; no universal airflow-per-Btu factor is claimed.
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 C is correct
Under the stated assumptions, approximately 10,000 cfm of makeup air balances the 10,000 cfm exhausted. All replacement-air sources must be considered in an actual design, and makeup air must not impair hood capture. A fire suppression system does not turn this into a 1% replacement-air calculation.
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 C is correct
ICC explains makeup air in relation to total exhaust and capture performance. Burner input alone cannot establish a universal replacement-air flow.
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