Fire Rated Interior Door A Fire Rated Interior Door is a specially engineered door designed to resist the spread of fire and smoke within a building. Made from fire-resistant materials like steel, gypsum, or solid wood with fire-rated cores, these doors are tested to withstand fire for a specified duration—commonly 20, 60, or 90 minutes. Ideal for residential, commercial, and industrial use, a Fire Rated Interior Door not only enhances the safety of occupants but also helps meet building code requirements. Whether installed in hallways, basements, or between a garage and living space, a Fire Rated Interior Door provides reliable protection and peace of mind.