When the fireproof door is opened, the door leaf crosses the deformation joint, which may cause the door to close loosely and pose a risk of fire. During acceptance, on-site simulation is required to initiate testing:

1. Measurement tool: Use a laser marking instrument to detect the opening trajectory of the door leaf, ensuring a distance of ≥ 50mm from the deformation joint;

2. Structural review: Verify the position of deformation joints in the drawings and the installation coordinates of fire doors to avoid design conflicts;

3. Dynamic verification: Repeatedly open and close the door leaf, observe whether there is any jamming or deviation, and focus on checking the firmness of the hinge installation.

Common problem: Some projects aim to compress installation space for aesthetic purposes, and special attention should be paid to hidden dangers in the decoration renovation project.