Structural Performance - Wind Resistance
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This test measures the wind pressure a 30" x 72" window can withstand without suffering breakage (structural shattering) or permanent damage (structural deformation). The chart below shows the DP (Design Pressure) ratings or the highest wind loads a window withstands.
| Wind Velocity |
Grade (USA) |
Window Type |
| 220 mph |
DP 85 |
Gilkey fixed, casement and awning windows |
| 205 mph |
DP 70 |
Gilkey sliding and hung windows |
| 180 mph |
DP 55 |
High-end |
| 160 mph |
DP 40 |
High-end |
| 130 mph |
DP 30 |
Mid-range |
| 110 mph |
DP 20 |
Low-end |
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The results are from national tests under the following standards:
AAMA NWDA 1011.S2-97
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