Assembley Halls	4-8	Hospitals	- Sterilising	15-25
Bakeries	20-30		- Wards	6-8
Banks	4-8	Kitchens	- Domestic	15-20
Bathrooms	6-10		- Commercial	20-30 Min
Battery Charging Rooms	6-8	Laboratories		6-15
Bedrooms	2-4	Laundrettes		10-15
Billiard Rooms *	6-8	Laundries		10-30
Boiler Rooms	15-30	Lavatories		6-15
Cafes & Coffee Bars	10-12	Lecture Theatres		5-8
Canteens	8-12	Libraries		3-5
Cellars	3-10	Living Rooms		3-6
Churches	1-3	Mushrooms Houses		6-10
Cinemas & Theatres *	10-15	Offices		6-10
Club Room *	10-12	Paint Shops (not cellulose)		10-20
Compressor Rooms	10-20	Photo & X-ray dark rooms		10-15
Dairies	8-10	Public House bars		10-15
Dance Halls *	8-12	Recording studios		10-12
Dye Works	20-30	Recording Control rooms		12-25
Electroplating Shops	10-12	Restaurants		8-12
Engine Rooms	15-30	Schoolrooms		5-7
Entrance Halls, Corridors	3-5	Shops & Showrooms		8-12
Factories & Workshops	8-10	Shower Baths		15-20
Foundries	15-30	Stores & Warehouses		3-6
Garages	6-8	Swimming Baths		10-15
Glasshouses	25-60	Toilets		6-10
Hairdressing salons	10-15	Welding Shops		15-30
* Increase by 50% where heavy smoking occurs, or if the room is underground