UFSI UNIVERSAL FIRESTOP INSERT FOR 1G 4S & 4-11/16 STEEL BOX

FIREBLOK's Universal Firestop Insert is intumescent thermoplastic pad used as a membrane penetration fire stop in electrical boxes maintaining the fire-resistant ratings of wall assemblies and when the horizontal separation between metallic boxes on opposite sides of the wall is less than 24” apart. The insert is certified for both 1 & 2 hour, U300, U400, V400 and U411 wall assemblies with metal electrical boxes with plastic or metal cover plates. UFSI can be used in different box sizes from single gang boxes, 4” Square boxes to 4-11/16” Square boxes.