Fan and Ventilation Useful Information
Minimum Air Changes Required Per Hour
| 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 |
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.
|
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  22m³ |
| Number of Air Changes Required |
3 |
10 |
| Performance |
8 x 3 = 24m³/h |
22 x 10 = 220m³/h |
| Fan Required |
XF100T = 85m³/h |
WF150MP = 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-on period of 15 minutes as stipulated in The Building Regulations.
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