704.7 Unexposed surface temperature

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704.7 Unexposed surface temperature.

Where protected openings are not limited by Section 704.8, the limitation on the rise of temperature on the unexposed surface of exterior walls the exterior wall in any story, the total area of the openings shall comply with the following formula:

A_e = A + (A_f X F_eo)

(Equation 7-1)

where:

A_e = Equivalent area of protected openings.

A = Actual area of protected openings.

A_f = Area of exterior wall surface in the story under consideration exclusive of openings, on which the temperature limitations of ASTM E 119 for walls are exceeded.

F_eo = An "equivalent opening factor" derived from Figure 704.7 base on average temperature of the unexposed wall surface and the fire-resistance rating of the wall.

This table is used to determine the equivalent opening factor Feo for 1 hour, 2 hour, 3 hour and 4 hour exterior walls. The factor is based on the Average temperature of unexposed surface (degrees of Fahrenheit

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Excerpts from 2000 INTERNATIONAL BUILDING CODE®

704.7 Unexposed surface temperature.

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