The door and window hardware is made of heat insulation door and window hardware profiles and insulating glass, which has the functions of energy saving, sound insulation, sound insulation, dust prevention, waterproof, etc. the thermal conductivity K value of the door and window hardware is below 3W / m2 K, which is an ordinary door and window. The heating cost is reduced by about 30%, the sound insulation volume is more than 29 dB, and the water tightness and air tightness are good, all reaching the A1 window standard. Door and window hardware is a general term for all kinds of metal and non-metal accessories installed on building doors and windows. It plays an auxiliary role in the opening and closing of doors and windows. The surface is generally treated by plating or coating, which has the characteristics of firmness, durability, flexibility, economy and beauty. Door and window hardware can be divided into building door lock, handle, support block, hinge, door closer, handle, bolt, window hook, anti-theft chain, inductive door opening and closing device, etc.

1. Profile wall thickness

In general, most of the door and window manufacturers in the home market with high material output are products with relatively thin wall thickness to reduce costs. The thickness of 1.2mm-1.3mm produced by small manufacturers is lower than the standard, but the standard stipulates that the thickness should be greater than or equal to 1.4mm.

Door and window hardware configuration files are usually divided into 60 series (6cm), 70 series (7cm), and the quality of door and window hardware is not good or bad. It depends on the material, wall thickness, insulating tape, process of door and window hardware; Quiet cells, not big windows, a series of 60 optional profiles is enough, if the battery's front, floor to ceiling windows, used to seal the high noise insulation requirements, 70 optional profiles series.

2. Auxiliary materials

When consulting the price of doors and windows hardware, we must ask whether it includes the cost of supporting beams, columns, horizontal hardware, positioners, screens, waterproof glue, polystyrene foam and other auxiliary materials, because many doors and windows hardware enterprises have quotations traps. In order to attract customers, they first reduce the unit price, and then charge various auxiliary materials to make up the difference. The cost of these auxiliary materials is usually several thousand yuan, and the total price is not cheap at all.

3. Add sub frame

Subframe is also called accessory frame and protective frame. The door and window frames are fixed on the wall for the installation of doors and windows. Generally used for 70 series and below profiles. If the window needs to be covered with window cover (window bayonet), tiles need to be pasted around the window, and the ceiling needs to be placed on the top of the window, then additional frames need to be added, because the frames of 70 series and below profiles are narrow, which will hinder the opening of doors and windows. The advantage of installing auxiliary frame is that there will be gaps on both sides of doors and windows after installation, which is not beautiful. After adding the auxiliary frame, all gaps can be covered. In terms of function, it is equivalent to the dumb mouth of doors and windows, but additional auxiliary frames need to be charged separately.

4. Seal design

Different brand profiles also have different sealing designs, such as three, four, five, six, seven, eight, nine, and even ten, such as different degrees of sealing design. However, the top ten metal door and window profile manufacturers have two open external seals, sealing window 3. In order to meet the needs of consumers, many domestic manufacturers have increased the number of door and window hardware configuration files of door and window hardware materials Department of wear belt track, so door hardware enterprises can wear their own strip, so there are some so-called seal series, in theory, more and better insulation seal number, but this does not explain the corresponding monitoring and evaluation as well as the authorities.