There are a variety of resources available to architects with questions on steel doors and frames.
For product-specific questions:
Contact your distributor. Most of them have been in business a long time and are very knowledgeable about doors, frames, hardware compatibility, installation, and fire labeling requirements.
For questions on standards or general steel door and frame inquiries:
The search bar on the top-right of the website can help you efficiently find the information you are seeking. You are also welcome to contact SDI Managing Director Jeff Wherry at [email protected] or (440) 899-0010.