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6. Calculate Size of Ventilation Fan

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