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Why Vent - Types of Fans - Siting the Fans - Ducting - Data Sheets

Suggested Size Fan - Calculator - ( see notes below )

Type of Room
Application
Length
Width
Height
   
Volume
Required Performance
 


for a second fan selector based only on the building regulations
and excludes Air Change Rates click here

Results reflect
Building Regulations Part F 1995 England Wales
minimum size fan allowed ( extract Table 1 ) - to see official ventilation regulations

a - Bathroom - 15 litres / second
b - Kitchen - 60 litres / second
b - Kitchen - 30 litres / second if within cooker hood or 300mm of a hob
c - Utility Room - 30 litres / second
In rooms with no natural light it would be appropriate for the fans to be controlled
by the operation of the light switch.

Excludes:
Loss of pressure from the use of ducting see Ducting
Dwellings with open-flued combustion appliances ( Gas / Oil or Solid fuel ) see Notes

Recommended Room - Air Change Rates

Domestic

We researched various
British manufacturers
who's range of recommended
room air rate changes are listed below

Room
Rate Used
In Shower Area
15 - 20
20
Bathroom & Shower Rooms
15 - 20
15
Bathroom
6 - 10
8
Bedrooms
2 - 4
4
Halls & Landings
4 - 6
5
Kitchens
10 - 20
15
Living & Other Domestic Rooms
4 - 6
5
Toilets - Domestic
6 - 10
8
Utility Rooms **
15 - 20
15


** Utility room means a room designed to or likely to be used to contain clothes washing and similar equipment such as a sink, washing machine, tumble dryer or other feature or equipment which may reasonably be expected to produce water vapour in significant quantities.

 
Commercial
    
Cafés
10 - 15
15
Canteens
8 - 12
10
Cellars
3 - 10
6
Changing Rooms with Showers
15 - 20
15
Conference Rooms
8 - 12
8
Garages
6 - 10
8
Hairdressing Salons
10 - 15
13
Hospital Wards
6 - 8
7
Laundries & Launderettes
10 - 15
13
Meeting Rooms
6 - 12
7
Offices
4 - 6
6
Restaurants & Bars
10 - 15
12
School Rooms
5 - 7
6
Shops
8 - 10
9
Sports Facilities
4 - 6
6
Store Rooms
3 - 6
5
Workshops
6 - 10
8


For more commercial room air rate recommendation