Minimum Air Changes Required Per Hour
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.
