This module will look at step seven. In this step you determine the number of extract points to satisfy the AvCv and this will depend on the co-efficient of the ventilator (usually 0.6) and the sizes available. For mechanical extraction you simply divide the total volumetric extract rate required by the rating of the fans. It may be necessary to add a fan if there is reason to believe a fan may be affected by the fire.  

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Exercise 69