| 21. | They are available with either fixed or movable louvers.
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| 22. | The most common method of controlling the louvers is the balanced swell pedal.
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| 23. | Some modern louver systems serve to improve indoor daylighting.
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| 24. | In industrial facilities such as steel power plants, louvers are very common.
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| 25. | A wider arena and faster louver speed cause a faster, tighter vortex.
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| 26. | Roll control was by differential actuation of the wing-fan exit louvers.
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| 27. | Most earlier models also had louvers near the bottom of each side panel.
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| 28. | One example was the return of the bonnet louvers.
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| 29. | Lining the fa�ade of the David Brower Center are fixed exterior aluminum louvers.
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| 30. | These louvers block the direct sun and minimize heat gains within the building.
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