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Steel Door Institute, Steel Door, Fire Rated Doors, Hollow Metal Door

Steel Door Institute

The #1 resource for commercial steel doors and frames

The Steel Door Institute (SDI) was established in 1954 as a voluntary, non-profit business association that develops quality and performance standards for steel doors and frames.

SDI’s standards are available without charge. Design professionals around the world specify these standards because they are concise and regularly updated with leading industry practices.

Only SDI Certified manufacturers undergo recurring audits to ensure compliance with our standards for strength, quality and consistency. By specifying SDI Certified, you can be assured you will receive a product that is well-constructed, tested, and evaluated to meet your specifications.

As a complete steel door and frame resource, the SDI website also has a Door Selector ToolFrequently Asked Questions and a Product Gallery. We also offer online and in-person continuing education for AIA and GBCI credit.

Introducing SDI Certified

To help ensure the doors and frames you specify meet our quality standards, the Steel Door Institute has developed a new industry certification called SDI Certified.

Manufacturers who hold this certification are regularly audited to SDI’s manufacturing, performance, and quality standards. By specifying SDI Certified, design professionals can be confident their products will be true to spec and built to last.