floor cavity index

number representative of the geometry of the part of a room between the floor and the utilization plane, used in calculation of utilization factor or utilance

Unit: 1

NOTE The floor cavity index is given by the formula

where *a* and *b* are the dimensions of the sides of the room and *h*_{f} is the distance from the floor to the utilization plane.

See also "room index"

See also US term "floor cavity ratio"

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