What is the meaning of DTM 1542 on architectural drawings?

Dtm 1542 in the architectural drawing refers to the dimension of Dtm door: length 1500mm, height 4200mm, and floor bouncing door in the hall decoration drawing.

The floor spring door is embedded door shaft spring or built-in vertical floor spring. The door leaf can be opened freely inside and outside, and it is in the closed position when it is not touched. Bullet door is a common door in decoration engineering, which can be opened freely inside and outside.

Classification of bullet doors:

According to the opening form, it can be divided into horizontal door, sliding door, revolving door and double door.

According to the material, it is divided into steel doors, glass doors, aluminum alloy doors and plywood doors.

According to the characteristics, it is divided into shutter doors, spring doors, automatic doors, fire doors, paneled doors and so on.

Combined, it can be called flat fireproof steel door, push-pull aluminum alloy door and so on.