1) Fixed fire-resistant window: A fire-resistant window without an operable sash.
2) Operable fire-resistant window: A fire-resistant window with an operable sash and equipped with a sash opening and closing control device.
3) Insulated fire-resistant window (Class A): A fire-resistant window that meets both fire resistance integrity and insulation requirements within a specified time.
4) Non-insulated fire-resistant window (Class C): A fire-resistant window that meets fire resistance integrity requirements within a specified time.
