Function/Item | With fasteners | Without fasteners | With negative wind pressure test | Without negative wind pressure test | Points and Remarks |
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Airtight sliding window | √ | √ | 1.Without the fasteners, there will be howling wind sounds. 2.Water can easily leak in during a hurricane |
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Casement Window | √ | √ | 1.Width. Narrow windows are not easily deformed, so they don’t need to have fasteners. (Normally, the horizontal frame of inner window is 60cm or less on the market) 2.If the window is too wide and required to add fasteners after the calculation, then it needs to have them. |
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Intelligent flat window | √ | √ | 1.With the fasteners, there won’t have wind howled sounds. 2.With fasteners, water doesn’t leak easily during a hurricane. |
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How to verify | Please provide physical evidence | Please provide physical evidence |
1.If you want to test whether there are any fasteners, you can push from any of the points A, B, C and D as shown in the outside picture . If it moves and creates gaps, it means water will easily ingress during a hurricane. |
*The calculation is based on the wind pressure required for each area and floor height.