Calculate Size of Ventilation Fan


  • Calculate Size of Ventilation Fan for Bathroom of 10 Foot Long,15 Foot width and 10 foot height .

Calculation:

  • Area of the Room=Length x Width x Height
  • Area of the Room=10 x 15 x 10 =1500 Cub. Foot
  • From the table Air Changing Rate (ACH) for Bathroom = 8 Times/Hour.
  • Size of Ventilation Fan = (Area of Room x ACH ) / 60
  • Size of Ventilation Fan = (1500 x 8 ) / 60 = 200 CFM
  • Size of Ventilation Fan = 200 CFM

 

Recommended Air Change Rates For  Room  (ACH)
Type of Room Air Change Rate /Hour Consider
Shower Area 15 To 20 20
Bathroom & Shower Rooms 15 To 20 15
Bathroom 6 To 10 8
Bedrooms 2 To 4 4
Halls & Landings 4 To 6 5
Kitchens 10 To 20 15
Living & Other Domestic Rooms 4 To 6 5
Toilets – Domestic 6 To 10 8
Utility Rooms 15 To 20 15
Cafés 10 To 15 15
Canteens 8 To 12 10
Cellars 3 To 10 6
Changing Rooms with Showers 15 To 20 15
Conference Rooms 8 To 12 8
Garages 6 To 10 8
Hairdressing Salons 10 To 15 13
Hospital Wards 6 To 8 7
Laundries & Launderettes 10 To 15 13
Meeting Rooms 6 To 12 7
Offices 4 To 6 6
Restaurants & Bars 10 To 15 12
School Rooms 5 To 7 6
Shops 8 To 10 9
Sports Facilities 4 To 6 6
Store Rooms 3 To 6 5
Workshops 6 To 10 8
Assembly rooms 4 To 8 8
Bakeries 20 To 30 25
Banks/Building Societies 4 To 8 5
Billiard Rooms * 6 To 8 5
Boiler Rooms 15 To 30 25
Canteens 8 To 12 10
Changing Rooms Main area 6 To 10 8
Changing Rooms Shower area 15 To 20 17
Churches 1 To 3 3
Cinemas and theatres * 10 To 15 12
Club rooms 0.12 0.12
Compressor rooms 10 To 15 15
Conference rooms 8 To 12 12
Dairies 8 To 10 10
Dance halls 0.12 0.12
Dental surgeries 12 To 15 15
Dye works 20 – 30 30
Electroplating shops 10 To 12  
Engine rooms 15 To 30 30
Entrance halls & corridors 3 To 5 5
Factories and workshops 8 To 10 10
Foundries 15 To 30 20
Glasshouses 25 To 60 50
Gymnasiums 0.6 0.6
Hospitals – Sterilizing 15 To 25 20
Kitchens – Domestic 15 To 20 15
Kitchens – Commercial 0.3 0.3
Laboratories 6 To 15 12
Lavatories 6 To 15 12
Lecture theatres 5 To 8 8
Libraries 3 To 5 4
Mushroom houses 6 To 10 8
Paint shops (not cellulose) 10 To 20 15
Photo & X-ray darkrooms 10 To 15 12
Public house bars 0.12 0.12
Recording control rooms 15 To 25 20
Recording studios 10 To 12 10
Shops and supermarkets 8 To 15 12
Squash courts 0.04 0.04
Swimming baths 10 To 15 12
Welding shops 15 To 30 20
 
 
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