Air Change Rates in some typical Rooms and Buildings
Recommended air change rates - ACH - in some typical rooms and buildings - auditoriums, kitchens, churches and many more
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The volume of fresh air required for proper ventilation is determined of the size and use of the space ventilated.
The table below can be used as an indication of recommended air changing rates in some common rooms and buildings.
| Building / Room | Air Change Rates - n - (AC/Hr.) |
| All spaces in general | min 4 |
| Attic spaces for cooling | 12 - 15 |
| Auditoriums | 8 - 15 |
| Banks | 4 - 10 |
| Barber Shops | 6 - 10 |
| Bars | 20 - 30 |
| Beauty Shops | 6 - 10 |
| Boiler rooms | 15 - 20 |
| Bowling Alleys | 10 - 15 |
| Cafeterias | 12 - 15 |
| Churches | 8 - 15 |
| Clubhouses | 20 - 30 |
| Cocktail Lounges | 20 - 30 |
| Computer Rooms | 15 - 20 |
| Court Houses | 4 - 10 |
| Dental Centers | 8 - 12 |
| Department Stores | 6 - 10 |
| Dining Halls | 12 -15 |
| Dining rooms hotels | 5 |
| Dress Shops | 6 - 10 |
| Drug Shops | 6 - 10 |
| Engine rooms | 4 - 6 |
| Factory buildings, ordinary | 2 - 4 |
| Factory buildings, fumes and moisture | 10 - 15 |
| Fire Stations | 4 - 10 |
| Foundries | 15 - 20 |
| Galvanizing plants | 20 - 30 |
| Garages repair | 20 - 30 |
| Garages storage | 4 - 6 |
| Homes, night cooling | 10 - 18 |
| Jewelry shops | 6 - 10 |
| Kitchens | 15 - 60 |
| Laundries | 10 - 15 |
| Libraries, public | 4 |
| Lunch Rooms | 12 -15 |
| Luncheonettes | 12 -15 |
| Nightclubs | 20 - 30 |
| Malls | 6 - 10 |
| Medical Centers | 8 - 12 |
| Medical Clinics | 8 - 12 |
| Medical Offices | 8 - 12 |
| Mills, paper | 15 - 20 |
| Mills, textile general buildings | 4 |
| Mills, textile dyehouses | 15 - 20 |
| Municipal Buildings | 4 - 10 |
| Museums | 12 -15 |
| Offices, public | 3 |
| Offices, private | 4 |
| Police Stations | 4 - 10 |
| Post Offices | 4 - 10 |
| Precision Manufacturing | 15 - 50 |
| Pump rooms | 5 |
| Restaurants | 8 - 12 |
| Retail | 6 - 10 |
| School Classrooms | 4 - 12 |
| Shoe Shops | 6 - 10 |
| Shopping Centers | 6 - 10 |
| Shops, machine | 5 |
| Shops, paint | 15 - 20 |
| Shops, woodworking | 5 |
| Substation, electric | 5 - 10 |
| Supermarkets | 4 - 10 |
| Town Halls | 4 - 10 |
| Taverns | 20 - 30 |
| Theaters | 8 - 15 |
| Turbine rooms, electric | 5 - 10 |
| Warehouses | 2 |
| Waiting rooms, public | 4 |
Note that in many cases local regulations and codes will govern the ventilation requirements.
The fresh air supply to a room can be calculated as
Q = n V (1)
where
Q = fresh air supply (ft3/h, m3/h)
n = air change rate (1/n)
V = volume of room (ft3, m3)
Example - Fresh Air Supply to Public Library
The fresh air supply to a public library with volume 1000 m3 can be calculated as
Q = 4 (1/h) 1000 (m3)
= 4000 m3/h
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