Specifications:
The document outlines the specifications for door measurements and structures. It emphasizes the importance of taking accurate measurements before ordering doors. The doors are made from jointed fir with a honeycomb hollow-core structure.

Procedures:
Always perform a measurement survey before ordering the door to ensure proper fit and function.

Standards and Measurements:
- Clear Opening Size: Calculated as L4 x H4, where L4 = L + 15 and H4 = H - 5.
- Effective Opening Dimensions: Provided in various sizes ranging from 600 x 1800 to 2400 x 2700.
- Door Measurement: LR x HR, with specific dimensions listed for different door sizes.

Wall Thickness:
- Finished wall thickness varies depending on the material: Plaster (105 - 145) and Plasterboard (100 - 150L2).

Recommendations:
Ensure all measurements are accurate and consider the type of wall finish when selecting door sizes.

Additional Information:
The document also mentions different types of door systems, including lacquered single and double doors, sliding opening systems, and flush-fitting doors.