Fan Air-changes Data

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Update time : 2026-10-08

Air Changes

Air Changes per hour

The air changes up to eight an hour provide for removing contamination normally caused by human occupants. The higher rates of air changes provide for removing heat and steam in temperate zones. In hot climates the air changes per hour should be at least doubled.

Where smoking occurs allow twice the number of air changes.

The Table below gives a guide to the number of air changes per hour generally accepted in ventilation.

SITUATION	AIR CHANGES PER HOUR
Assembly Halls	4 – 6
Bakeries	20 - 30
Banks	2 - 4
Billiard Rooms	6 - 8
Boiler House	20 - 30
Cafes & Coffee Bars	10 - 12
Canteens	4 - 6
Churches	1/2 - 1
Cinemas	10 - 15
Club Rooms	8 - 10
Dance Halls	6 - 8
Dye Works	20 - 30
Engine Rooms	20 - 30
Ensuites	15 - 20
Factories (Workshops)	6 - 10
Foundries	20 - 30
Garages	6 - 8
Hospitals (General Wards)	4 - 6
Hotel Bars	4 - 6
Kitchens (Commercial)	15 - 20
Kitchens (Domestic)	10 - 15
Laboratories	4 - 6
Lavatories	10 - 15
Laundries	20 - 30
Machine Shops	6 - 10
Offices	4 - 6
Paint Shops	30 - 60
Photographic Darkrooms	10 - 15
Pig Houses	6 - 10
Poultry Houses	6 - 10
Residences	1 - 2
Restaurants	6 - 10
School Classrooms	2 - 3
Swimming Baths	20 - 30