本规范为普通和防火门及框架结构提供了多种选择。用户必须从规范中选择最适用于本项目的特定等级的门和门框。本规范涵盖1-3/4英寸超重型钢门、1-3/4英寸重型钢门、1-3/4英寸和1-3/8英寸标准重型钢门的尺寸、类型、材料、一般施工要求和饰面，以及框架和附件。它们是不受变化影响的标准项目。

This specification for swinging steel doors and frames offers a number of choices in both regular and fire rated door and frame constructions. The user must select from the specification the specific grades of doors and frames that best apply to the project.This specification covers sizes, types, materials, general construction requirements and finishing of 1-3/4 in extra heavy duty steel doors, 1-3/4 in heavy duty steel doors, 1-3/4 in and 1-3/8 in standard duty steel doors, together with frames and accessories. They are intended to be standard items not subject to variations.