What is the occupancy factor used by the Insurance Services Office (ISO) for computing required...

The occupancy factor used by the Insurance Services Office (ISO) for computing required fire flow for C-3 (Combustible) is 0.85. This means that the combustible occupancy has a moderate fire load and requires 85% of the fire flow calculated for the same building withan ordinary occupancy. The occupancy factor reflects the influence of the contents and activities within the building on the potential fire severity. The ISO assigns different occupancy factors for different types of occupancies, ranging from 0.60 for low fire load to 1.75 for high fire load12

References:

Guide For Determination Of Required Fire Flow 06-06-20141

Guide For Determination Of Required Fire Flow 07-20052