Type of Room Air Change Rate /Hour Shower Area 15 To 20 Bathroom & Shower Rooms 15 To 20 Bathroom 6 To 10 Bedrooms 2 To 4 Halls & Landings 4 To 6 Kitchens 10 To 20 Living & Other Domestic Rooms 4 To 6 Toilets – Domestic 6 To 10 Utility Rooms 15 To 20 Cafés 10 To 15 Canteens 8 To 12 Cellars 3 To 10 Changing Rooms with Showers 15 To 20 Conference Rooms 8 To 12 Garages 6 To 10 Hairdressing Salons 10 To 15 Hospital Wards 6 To 8 Laundries & Launderettes 10 To 15 Meeting Rooms 6 To 12 Offices 4 To 6 Restaurants & Bars 10 To 15 School Rooms 5 To 7 Shops 8 To 10 Sports Facilities 4 To 6 Store Rooms 3 To 6 Workshops 6 To 10 Assembly rooms 4 To 8 Bakeries 20 To 30 Banks/Building Societies 4 To 8 Billiard Rooms * 6 To 8 Boiler Rooms 15 To 30 Canteens 8 To 12 Changing Rooms Main area 6 To 10 Changing Rooms Shower area 15 To 20 Churches 1 To 3 Cinemas and theatres * 10 To 15 Club rooms 0.12 Compressor rooms 10 To 15 Dairies 8 To 10 Dance halls 0.12 Dental surgeries 12 To 15 Dye works 20 – 30 Electroplating shops 10 To 12 Engine rooms 15 To 30 Entrance halls & corridors 3 To 5 Factories and workshops 8 To 10 Foundries 15 To 30 Glasshouses 25 To 60 Gymnasiums 0.6 Hospitals – Sterilizing 15 To 25 Kitchens – Domestic 15 To 20 Kitchens – Commercial 0.3 Laboratories 6 To 15 Lavatories 6 To 15 Lecture theatres 5 To 8 Libraries 3 To 5 Mushroom houses 6 To 10 Paint shops (not cellulose) 10 To 20 Photo & X-ray darkrooms 10 To 15 Public house bars 0.12 Recording control rooms 15 To 25 Recording studios 10 To 12 Shops and supermarkets 8 To 15 Squash courts 0.04 Swimming baths 10 To 15 Welding shops 15 To 30 Basement Parking 15-30 Residential Basement 3–4 Residential Bathroom 6-7 Residential Living Rooms 6-8 Laundry 8-9 Business Lunch Break Rooms 7-8 Business Copy Rooms 10-12 Computer Rooms 10-14 Restaurant Dining Area 8-10 Restaurant Food Staging Area 10-12 Public Hallway 6-8 Public Retail Store 6-10 Public Foyer 8-10 Smoking rooms 15-20 Classrooms 3-4 Warehousing 3-10
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