Division 7 Ebook Page 586 CMU Perimeter Fire Containment Joint ASTM E2307 Tech Bulletin

Technical Bulletin CMU-04 ENCLOSURE SOLUTIONS Underwriters Laboratories Joint Design Numbering System The systems are identified by alpha-numeric designations. The first two characters, CW or FW indicate the joint system is used for the interface between a floor and curtain wall, or, a floor and wall respectively. The third character, S or D, identifies if the joint system was tested for movement, "S" meaning static or not tested for movement, and "D" meaning dynamic or tested for movement. The number portion of the identification indicates the maximum distance that the joint can span between the wall and the edge of the floor. Numbers in the range of 000-999 are less than or equal to 2". 1000-1999 are less than or equal to 6". 2000-2999 are greater than 6" and less than or equal to 12". Joint Ratings F, I, T, and L The F-rating, or, Integrity rating, expressed in hours, indicates the length of time that a fire resistant joint can withstand fire before being consumed or before permitting the passage of flame through the opening. The T-rating, or, Insulation rating, expressed in hours, indicates the length of time that the temperature on the non-fire side of the penetration does not exceed 325 o F (163 o C) above the ambient temperature. This ensures that the temperature on the side of the wall away from the flame does not reach the flash point of any materials on that side of the wall. The L-rating (optional), expressed in cubic feet per minute, is the amount of air (or cold smoke) that may leak through a penetration. Movement Ratings ANSI/UL 2079 requires that joint systems with movement capabilities be cycled through the intended range of movement prior to fire testing. Movement cycling is intended to stress the joint design and test its durability while spanning between the elements of the fire resistive assembly. Class I joints are subjected to 500 cycles at 1 cycle per minute, Class II, 500 cycles at 10 cycles per minute, and Class III, 100 cycles at 30 cycles per minute. Figure 2 Figure 3 Figure 4

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