// CODE SNIPPET

705.8.4 Mixed Openings

Building Code 2018 of Illinois > 7 Fire and Smoke Protection Features > 705 Exterior Walls > 705.8 Openings > 705.8.4 Mixed Openings

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Where both unprotected and protected openings are located in the exterior wall in any story of a building, the total area of openings shall be determined in accordance with the following:

(Equation 7-2)

where:

A_p = Actual area of protected openings, or the equivalent area of protected openings, A_e (see Section 705.7).

a_p = Allowable area of protected openings.

A_u = Actual area of unprotected openings.

a_u = Allowable area of unprotected openings.

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705.8.4 Mixed Openings