本指南规范阐述了焊接钢加劲空心金属门和框架产品的要求，这些产品的使用频率低于商业和机构应用。此外，对于这些低频应用，请考虑ANSI/NAAMM HMMA-867《商用叠层空心金属门和框架的指导规范》。

This guide specification addresses the requirements for welded steel stiffened hollow metal doors and frame product that are subject to lower frequency use than commercial and institutional applications. Also, for these lower frequency applications, give consideration to ANSI/NAAMM HMMA-867, "Guide Specifications for Commercial Laminated Core Hollow Metal Doors and Frames".