STI Electrical Box Insert,Red,Intumescent

Electrical Box Insert; Fire Rating 2 hr; Fire Resistance Type Intumescent; Overall Width 3.75 in; Roll Length Not Applicable; Color Red; Expansion Temperature 350 Degrees F; Features Easily Preinstalls Before Shipping to the Jobsite; Eliminates the Need for Putty; Suitable for Steel and Plastic Face Plates; Flame Spread Index 64; Flame Spread Rating Class C; For Material Type Plastic; Steel; For Use On Steel Electrical Box; Market Commercial; Industrial; Residential