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Design Pressure Charts
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Design Pressures for Wall Opening |
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| Briscoe Shutters proudly displays the following charts for the Design Pressures – Wall Openings charts from 110 mph to 179.6 mph, Exposure B, C, & D |
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Wind Velocity = Wind Speed in MPH |
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Exposure Categories |
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Exposure A |
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Large city centers within at least 50 percent of the building having a height in excess of 70 feet (22336 mm). Use of the exposure category shall be limited to those areas for which terrain representative of Exposure A prevails in the unwind direction for a distance of at least 0.5 mile (0.8 km) or 10 times the height of the building or other structure, whichever is greater. Possible channeling effects or increased velocity pressures due to the building or structure being located in the wake of adjacent buildings shall be taken into account. |
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Exposure B |
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Urban and suburban areas, wooded areas, or other terrain with numerous closely spaced obstructions having the size of single-family dwellings or larger. Exposure B shall be assumed unless the site meets the definition of another type exposure. |
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Exposure C |
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Means, except in the High-Velocity Hurricane Zone, that area which lies within 1,500 feet (457 mm) of the coastal construction control line, or within 1,500 feet (457 mm) of the mean high tide line, whichever is less. On barrier islands, Exposure C shall be applicable in the coastal building zone set forth in Section 161.55 (4), Florida Statutes. |
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Exposure D |
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Flat, unobstructed areas exposed to wind flowing over open water (excluding shorelines in hurricane prone regions) for a distance of at least 1 mile (1.61 km). Shorelines in Exposure D including inland waterways, the Great Lakes and coastal areas of California, Oregon, Washington, and Alaska. This exposure shall apply only to those buildings and other structures exposed to the wind coming from over the water. Exposure D extends inland from the shoreline a distance of 1,500 feet (457 m) or 10 times the height of the building or structure, whichever is greater. |
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Importance Factor – We used 1.00 for the charts |
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Importance Factor: |
Bldg Categories |
Non-Hurricane |
Hurricane |
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Low Hazard to Human Life |
I |
0.87 |
0.77 |
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Typical Buildings |
II |
1.00 |
1.00 |
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High Hazard to Human Life |
III |
1.15 |
1.15 |
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Essential Facilities |
IV |
1.15 |
1.15 |
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Zone Location – Briscoe Shutters Inc. We use Zone 5 for all Chart Calculations |
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Zone 5 – Edge Zone of Wall |
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Zone 4 – Interior Zone of Wall |
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| Contact your local Building Department, Architect, or Engineering firm for the exact wind speed and exposure classification in your area. You can also call of email BSI with your exact window opening sizes; we will be happy to provide for you the exact design pressure calculations for yourexact window openings. |
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| 110 mph, Exposure B |
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110 mph, Exposure C |
| 115 mph, Exposure B |
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115 mph, Exposure C |
| 120 mph, Exposure B |
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120 mph, Exposure C |
| 125 mph, Exposure B |
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125 mph, Exposure C |
| 130 mph, Exposure B |
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130 mph, Exposure C |
| 135 mph, Exposure B |
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135 mph, Exposure C |
| 140 mph, Exposure B |
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140 mph, Exposure C |
| 145 mph, Exposure B |
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145 mph, Exposure C |
| 150 mph, Exposure B |
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150 mph, Exposure C |
| 150 mph, Exposure D |
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| 155 mph, Exposure C |
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155 mph, Exposure D |
| 165.6 mph, Exposure D |
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179.5 mph, Exposure C |
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