1、anufacturers: choose a highly qualified manufacturer with approved licences.

2、Materials: The surface should be smooth, without distortion, scratches, high gloss or scrub. Also, it should not fade easily. Check whether material thickness meets the requirements: frame :2.0-3 .0 mm; inner fan :2.8-4 .0 mm

3、Process: Screw connection (diameter Φ10), Special Corner (angle code thickness: 6mm) welded corners, the selection of the waist band in the waist-piece aluminum. Aluminum plates should not be used because the aluminum plates will be aging, deformed and crack.

4、Design and Overall Configuration: Door should be nice, with good proportions. A standard door is 900mm (W) × 2100mm (height), with 8mm toughened glass configuration. The inner fan weighs about 40kg. It is suggested that the vertical should be 53-60mm and the horizontal should be 55-100mm (For a small door door shaft axis). However, if the door hole size is larger than the standard size, then the strengthened type should be used------For vertical: 80mm or more; for horizontal: 90-200mm. Door closers should be heavier type (see the specific instructions closers), door shaft should be a large size.

5、Service: accurate and timely.