To calculate the correct fan required for a particular room you need to know the room volume in cubic metres, i.e. length x breadth x height, and then multiply by the number of air changes required.

 

Bathroom & Shower Rooms 3 Conference Rooms 8 Living & Other Domestic Rooms 3 Sports Facilities 6 Bedrooms 2 Garages 6 Meeting Rooms 4 Store Room 3 Cafés 10 Hairdressing Salons 10 Offices 6 Toilets - Domestic 3 Canteens 8 Halls & Landings 3 Restaurants & Bars 6 Toilets - Public 10 Cellars 3 Hospital Rooms 4 School Rooms 2 Utility Rooms 15 Changing Rooms with Showers 15 Laundries & Launderettes 10 Shops 8 Workshops 6

 

  Example 1 Example 2 Room Bathroom Kitchen Volume 2.0 x 2.0 x 2.0 = 8m³ 2.8 x 2.8 x 2.8 approx = 22m³ Number of Air Changes Required 3 10 Performance 8 x 3 = 24m³/h 22 x 10 = 220m³/h Fan Required XF100T = 85m³/h WF150A = 220m³/h

Stale air is also removed by installing the appropriate Manrose fan. In certain circumstances, such as in toilets, a timer is incorporated to provide an automatic turn-off period of 15 minutes as stipulated in The Building Regulations.