1, cavity

The more cavities in the main frame, the more stiffening ribs, and the stronger the bearing capacity of the window frame. It is best to use more than three cavities for large glass. The more cavities, the better sound transmission and sound insulation. Generally, six holes are best.

2, heat insulation strip

If the heat insulation strip is designed as an isotherm, there will be no cold bridge and hot bridge, and the heat insulation effect will be better. The heat insulation strip is multi-cavity honeycomb, filled with adhesive tape, which has better heat insulation and sound insulation performance. The straight heat insulation strip is cancelled.

3. Gland piece

Three seals are the standard process, and there must be three seals for duckbill adhesive tape sealing, that is, the sealing between the glass fan and the main frame, the sealing between the heat insulation strip and the profile, and the sealing of the screen window. Don't be fooled by other seals.

4. Others

Information can also be seen from the cross section of the broken bridge aluminum, such as whether the glass fan and screen window are flat inside and flat outside, whether the glass is fixed with glue or tape, whether there is micro-foaming between the glass and the profile, and whether there is moisture-proof molecular sieve under the hollow glass.

Some road sections, at first glance, are fake broken bridges with aluminum connections in the middle.