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THIS PRODUCT HAS BEEN DISCONTINUED. THE INFORMATION ON THIS PAGE MAY NO LONGER BE ACCURATE.

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Manufacturer's Product Description

Description
921 | 925 Mineral Wool and Sealant
Economical system for joint widths up to 3" (76mm)
Mineral wool supplied in 4' (1.2m) lengths and friction-held in gap for easy installation.
3 hour rated meeting UL2079.
System accommodates horizontal movement to 3 3/16" Movement: +/- 20%.
Meets "Hose Stream Test" for masonry walls.
Details
Joint width: 1"-20", Movement: +/- 50%

Activity with 920 Firestop System