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.