RECTOR - Rectorseal 66367 Metalcaulk Box Guard Fire-Rated Pad, Double

Metacaulk Box Guard is a 1-component fire-rated pad for use in electrical boxes. When exposed to fire, it will expand forming a char that seals the opening, prevents spread of flames & limits temperature rise on unexposed surfaces. Features: Metacaulk Box Guard is applied by hand, and must comply with NEC 314.16 (formerly 370.16) or other applicable codes. STC 53 Rating, Tested in a UL 411 wall assembly/section to ASTM E90.; Easy to Install- Adheres to Back of Electrical Box. Cost Effective and Great for retrofit jobs.; Highly Intumescent firestop material; Non-Conductive, Dielectric Breakdown Voltage 22V/mil (ASTM D 149); A labor saving, economical alternative to putty pads. - Applications: Insert on inside back panel of electrical boxes to maintain integrity of fire-rated wall assemblies; When used as directed, horizontal separation between outlet boxes on opposite sides of wall may be less than 24 inches. - Recommended Use: Use only in tested configuration recommended by RectorSeal.