Standard features include:4-hour fire-rated construction — backed by a 15-year structural warranty3-hour fire-rated door — third party tested and labeledGravity air flow vents — UL Listed fire dampers with fusible linksSecondary containment — leakproof all welded sumpRemovable, galvanized steel grate flooring42-inch (1.07-m) wide door with UL listed, keyed lockset for securityDoor closer — ensures doors close automaticallyNFPA 704 diamond decal provides "Right to Know" informationMultiple static