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Building Regulations

The Building Regulations Document F1 (1995 Edition) outlines the importance of ventilation and stipulates that mechanical ventilation must be installed in kitchens, bath / shower rooms and toilets.
 
All TLC fans comply with or exceed current Building Regulations and are capable of extracting not less than 60 litres per second from kitchens and not less than 15 litres
per second from bath/shower rooms. This means that humidity is removed at source before it can reach the cooler part of the dwelling and cause damage.

 
Specific requirements of The Building Regulations Document F1 (1995 Edition) on ventilation are as follows:

  • Bathrooms:
    The Regulations require a fan capable of minimum extract capacity of 15 litres per second 54mhr (32CFM).

     
  • Toilets:
    The Regulations require a fan capable of at least 3 air changes per hour and with a 15 minute over-run timer.
    N.B. 15 minute over-run is not a requirement in Scotland.

     
  • Kitchens:
    The Regulations require a fan capable of extracting 60 litres per second 216mhr (127CFM).

     
  • Utility Rooms:
    The Regulations require a fan capable of extracting 30 litres per second 108mhr (63CFM).
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.
Minimum Air Changes Required Per Hour
Bathroom & Shower Rooms
3
  Living Other Domestic Rooms
3
Bedrooms
2
  Meeting Rooms
4
Cafs
10
  Offices
6
Canteens
8
  Restaurants & Bars
6
Cellars
3
  School Rooms
2
Changing Rooms with Showers
15
  Shops
8
Conference Rooms
8
  Sports Facilities
6
Garages
6
  Store Room
3
Hairdressing Salons
10
  Toilets - Domestic
3
Halls & Landings
3
  Toilets - Public
10
Hospital Rooms
4
  Utility Rooms
15
Laundries & Launderettes
10
  Workshops
6

 

 
Example 1
Example 2
Room Bathroom Kitchen
Volume 2.0 x 2.0 x 2.0 = 8m 2.8 x 2.8 x 2.8 22m
Number of Air Changes Required
3
10
Performance 8 x 3 = 24m/h 22 x 10 = 220m/h
Fan Required XF100T = 85m/h WF150MP = 220m/h

Stale air is also removed by installing the appropriate TLC 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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