1. When using fixed installation, the mounting positions of the spacers and setting blocks should be between 1/10~1/4 of the edge length away from the grooved corner.  

2.  If open installation method is used, the distance between grooved corner and the mounting position of the spacer and setting block should be ≥30mm. When the hinges mounted on the window frame are located between the 30 mm of grooved corner and the spot that is 1/4 of the edge length away from the grooved corner, the mounting position of the spacer and setting block should be consistent with the mounting position of the hinge.  

3.  The spacer or setting block should not block the weep holes.