General Administration of Quality Supervision, Inspection and Quarantine of the People‘s Republic of China
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GB/T 5825-1986
Scope
The purpose of formulating this standard is to adopt uniform symbols on architectural drawings to express the opening and closing directions of doors and sashes, and to distinguish and express the opening and closing surfaces of each door and window sashes.
GB/T 5825-1986 history
1986GB/T 5825-1986 Symbolic designation of direction of opening and closing and faces of doors and windows