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          Selection and purchase of aluminum doors and windows for broken bridges
          Add the date:[2018-03-05 9:31:59]
          The entry of the article:www.hotyouki-ninnki.com
          Number of visits:[486]
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          Water tightness

          Water tightness refers to the ability of closed outer (door) windows to prevent rainwater leakage under the simultaneous action of wind and rain. This index is one of the three basic physical properties of doors and windows. The provisions of relevant state departments, often affected by the typhoon hit the area should be watertight grade 350Pa/ square meters above the doors and windows. Often by the wind and rain place, can be windows water tightness grade 250Pa/ square meters around the. A balcony or a rain shelter place, water tightness level 150Pa/ square meters below the doors and windows.  

          Air tightness

          Air tightness refers to the ability of the outer (door) window to stop the air penetration in the closed state. This index is one of the three basic physical properties of doors and windows. In general, air tightness level residential buildings 1~6 layer outside the window and balcony doors, should not be lower than the current national standard "building outside the window of air permeability classification and detection method of GB 7107" provisions of the 3 level; air tightness level of public building outside the window, 7 layer and 7 layer above the windows of residential buildings and Yang a door, not to be lower than the standard 4.

          Soundproof

          The noise in the indoor environment of a green and healthy residence is generally not more than 35dB. Otherwise, living in a long time will affect the health of the people, so the noisy areas should choose the products with better sound insulation performance.

          - thermal insulation

          The key to the energy saving of doors and windows is to see the thermal insulation parameters of the doors and windows, that is, the K value, that is, the heat conduction coefficient we often say. The lower the heat conduction coefficient, the better the insulation performance of doors and windows.


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