Code of Massachusetts Regulations
780 CMR - STATE BOARD OF BUILDING REGULATIONS AND STANDARDS
Chapter 7 - Fire and Smoke Protection Features
Section 705 - EXTERIOR WALLS
Subsection 705.7 - Unexposed surface temperature
Universal Citation: 780 CMR MA Code of Regs 705.7
Current through Register 1531, September 27, 2024
Where protected openings are not limited by Section 705.8, the limitation on the rise of temperature on the unexposed surface of exterior walls as required by ASTM E 119 or UL 263 shall not apply. Where protected openings are limited by Section 705.8, the limitation on the rise of temperature on the unexposed surface of exterior walls as required by ASTM E 119 or UL 263 shall not apply provided that a correction is made for radiation from the unexposed exterior wall surface in accordance with the following formula:
| Ae = A + (Af Feo) | (Equation 7-1) |
| Ae | = | Equivalent area of protected openings. |
| A | = | Actual area of protected openings. |
| Af | = | Area of exterior wall surface in the story under consideration exclusive of openings, on which the temperature limitations of ASTM E 119 or UL 263 for walls are exceeded. |
| Feo | = | An "equivalent opening factor" derived from Figure 705.7 based on the average temperature of the unexposed wall surface and the fire-resistance rating of the wall. |
| For SI: °C = [(°F) - 32] / 1.8. |
FIGURE 705.7 EQUIVALENT OPENING FACTOR
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