Ventilation — Texas ACR A Practice Questions

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why B is correct

18 − 12 = 6 inches. Resolve the coordination conflict against the actual access detail; the exercise does not invent a universal ceiling clearance.

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why B is correct

120 × 30 / 60 = 60 cfm averaged over an hour. Average volume alone does not establish that intermittent operation meets an applicable ventilation standard.

Where to look it up

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

Why C is correct

The rule uses 4% of the floor area being ventilated: 250 × 0.04 = 10 square feet of openable area. This is not a universal bedroom window size; only the openable portion counts. The calculation does not determine emergency escape, light or other requirements.

Where to look it up

Explicit exercise assumptions; not a universal code requirement.

Why B is correct

Supply totals 100 cfm and exhaust totals 90 cfm, so the difference is +10 cfm. This arithmetic does not predict building pressure without considering other air paths.

Where to look it up

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

Why A is correct

Replace the disposable filter as specified after following the equipment service and isolation instructions. Washing a nonwashable filter or choosing a more restrictive filter without checking system compatibility is not an equivalent remedy.

Where to look it up

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

Why A is correct

Inspection and replacement are different actions. Follow the system and filter instructions, monitor condition and applicable pressure criteria, and act when service is needed. A universal three-month rule cannot be inferred for every filter.