First is looking at the performance of doors and windows. Aluminum alloy doors and windows usually assess the following main properties: strength, air tightness, water tightness, opening and closing force, sound insulation, thermal insulation, nylon guide wheel durability, open lock durability and other factors.

Second is looking at the appearance of the doors and windows. The appearance of doors and windows also is the key. The aluminum alloy doors and windows are composed of artificial oxide film and coloring surface composite membrane layer, this kind of composite membrane not only corrosion resistance, wear resistance, and has the certain fire prevention function, high gloss. When choosing, try to match as much as possible, try to choose on the right product of manufacturer of aluminum alloy doors and windows, select fine processing, precise, open and close with sensitive, quiet, gentle and adornment effect products.

The third is looking at the price of the doors and windows. Under normal conditions, high quality aluminum alloy doors and windows have high capital consumption, the price30{7def8a5b3f9b5c758096170b0aad5672e7a91d92b597d186c30b1ef747c431ea}more than inferior aluminum alloy door. Some wall thickness is only 0.6 0.8 millimeter ,aluminous profile made of aluminum alloy doors and Windows, tensile strength and yield strength is much lower than nation specification rules, which is not very safe. We must not be ignored the safe factor due to the greed of cheap thing.

Aluminum alloy doors and windows need careful observation places: