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.
Exercise 44
Exercise 45
Exercise 46
Exercise 47
Exercise 48
Exercise 49
Exercise 50
Exercise 51
Exercise 52
Exercise 53
Exercise 54
Exercise 55
Exercise 56
Exercise 57
Exercise 58
Exercise 59
Exercise 60
Exercise 61
Exercise 62
Exercise 63
Exercise 64
Exercise 65
Exercise 66
Exercise 67
Exercise 68
Exercise 69