What is the definition of gross occupant load factor?

• A. Measured wall to wall
• B. Measured floor area
• C. Measured volume per occupant
• D. Measured ceiling height

Answer: (A)

The concept being tested is how gross occupant load factor is determined. In NFPA 101/1031, the gross occupant load factor uses gross floor area, which means you measure the space from finished wall to finished wall—the entire floor area contained within the building envelope. This wall-to-wall measurement defines the floor area that will be divided by the occupant load factor to estimate how many people the space can safely accommodate.

Why this matters: using wall-to-wall measurements ensures you’re counting the full area inside the exterior walls, including spaces that are part of the usable footprint. The other options don’t fit because occupant load factors are tied to floor area (not just a generic floor area, and not to volume or ceiling height). Volume per occupant or ceiling height aren’t the basis for the gross occupant load factor in this context. For example, a 1,200 sq ft space measured wall-to-wall would use that gross floor area when applying the occupant load factor to estimate the number of occupants.