1. The hinge, slide rail and lock with good sealing performance shall be selected. When choosing, open and close, pull several times to feel its flexibility and convenience.

2. The lock with good flexibility should be selected. When purchasing, the key can be inserted and turned several times to see if it is smooth or not, and whether the switch is turned to save energy.

3. Select the kind of decorative hardware with good appearance performance. When purchasing, it is mainly to see whether there are defects in the appearance, how the electroplating luster is, whether the texture is smooth, etc.

(1) Doors and windows and accessories: must meet the design requirements, specifications and models should meet the national standards.

(2) Floor spring: the floor spring of the door should be stainless steel or copper. Before formal use after installation, the opening and closing speed should be adjusted to facilitate use. The hydraulic part must not leak. The door fixing device can also be used.

(3) Door lock: it should be a double-sided safety lock.

(4) Pusher: stainless steel, aluminum alloy or copper.

(5) Pulley and pulley frame: the pulley can be made of hard nylon wheel and pulley frame, generally galvanized steel products.

(6) Sealing material: sealing rubber strip should be used together with waterproof sealant.