Occupied spaces shall be ventilated _____.

Occupied spaces shall be ventilated _____.

• A. By natural means in accordance with section 402 of the IMC
• B. A and C apply
• C. By a mechanical means in accordance with section 403 of the IMC
• D. 24 hours per day

Answer: (B)

Ventilation for occupied spaces can be provided in two legitimate ways: naturally through openings and the outdoor environment, or mechanically through a ventilation system. The IMC reserves separate, but compatible, rules for each method: natural ventilation is addressed in section 402, while mechanical ventilation is covered in section 403. Because the requirement is that occupied spaces be ventilated, either method can meet the rule depending on the building design, climate, and use. That’s why the best answer reflects that both approaches apply. The idea that ventilation must run 24 hours a day isn’t a universal mandate for all spaces; continuous operation isn’t required unless the specific space or code section calls for it.

Ventilation for occupied spaces can be provided in two legitimate ways: naturally through openings and the outdoor environment, or mechanically through a ventilation system. The IMC reserves separate, but compatible, rules for each method: natural ventilation is addressed in section 402, while mechanical ventilation is covered in section 403. Because the requirement is that occupied spaces be ventilated, either method can meet the rule depending on the building design, climate, and use. That’s why the best answer reflects that both approaches apply. The idea that ventilation must run 24 hours a day isn’t a universal mandate for all spaces; continuous operation isn’t required unless the specific space or code section calls for it.