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NWCG_Guidance |
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Flame Length (ft) |
(BTUs/sec/ft) |
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| Most prescribed burns are conducted in this range. |
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| Generally represent the limit of control for direct attack methods. |
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| Machine methods usually necessary or indirect attack should be used. |
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| The prospects for direct control by any means are poor above this intensity. |
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| The heat load on people within 30 feet of the fire is dangerous. |
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| Above this intensity, spotting, fire whirls, and crowning should be expected. |