Comes in 4 sizes: 3 ¼” x 3 ¼” x 3/16”, 3 ¾” x 3 ¾ x 3/6”, 4 ¾” x 4 ¾” x 3/16”, 3 ½ x 1 ½ x 3/16” to fit a variety of electrical boxes.
Intumesces 100X.
Slits in electrical box insert allow easy access to back of box.
Tested in accordance with ASTM E84 (UL 723), ASTM E90, ASTM E119 (UL 263) and ASTM E814 (UL 1479) (Certified as a Wall Opening Protective Material, UL Category CLIV).