Steel windows and doors are stronger than any alternative material. By direct comparison, they are three times stronger than aluminum. The design flexibility offered by steel windows and doors, together with exceptional durability and life cycle, make steel windows and doors an excellent choice in renovation projects. Steel windows and doors can be designed to meet the most stringent building requirements for both blast resistance and impact resistance. Because steel windows and doors are inherently more durable than almost any alternative material used in construction, their life cycle is unsurpassed.