|
Building / Room
|
Air Change Rates
- n -
(1/hr)
|
|
All Spaces in general
|
min 4
|
|
Attic spaces for cooling
|
12 - 15
|
|
Auditoriums
|
8 - 15
|
|
Bakery
|
20 - 60
|
|
Banks
|
4 - 10
|
|
Barber Shops
|
6 – 10
|
|
Bars
|
20 - 30
|
|
Beauty Shops
|
6 – 10
|
|
Boiler rooms
|
20 – 60
|
|
Bowling Alleys
|
10 – 15
|
|
Cafeterias
|
12 – 20
|
|
Churches
|
15 – 30
|
|
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
|
|
Dormitories
|
7 – 12
|
|
Dress Shops
|
6 - 10
|
|
Drug Shops
|
6 - 10
|
|
Engine rooms
|
12 – 30
|
|
Factory buildings, ordinary
|
6 – 15
|
|
Factory buildings, fumes and moisture
|
10 – 15
|
|
Fire Stations
|
4 - 10
|
|
Foundries
|
15 - 30
|
|
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
|
20 - 60
|
|
Libraries, public
|
15 - 30
|
|
Locker Rooms
|
4 – 15
|
|
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
|
7 – 12
|
|
Mills, textile dyehouses
|
15 - 20
|
|
Municipal Buildings
|
4 – 10
|
|
Museums
|
12 –15
|
|
Offices, public
|
5 – 12
|
|
Offices, private
|
5 – 12
|
|
Packing Houses
|
12 – 20
|
|
Plating Rooms
|
12 - 60
|
|
Police Stations
|
4 – 10
|
|
Post Offices
|
4 – 10
|
|
Precision Manufacturing
|
15 - 50
|
|
Printing Shops
|
6- 12
|
|
Pump rooms
|
5
|
|
Restaurants
|
8 - 20
|
|
Rest Rooms
|
6 – 12
|
|
Retail
|
6 – 10
|
|
School Classrooms
|
6 – 12
|
|
Shoe Shops
|
6 – 10
|
|
Shopping Centers
|
6 – 10
|
|
Shops, machine
|
6 – 12
|
|
Shops, paint
|
15 - 20
|
|
Shops, woodworking
|
5
|
|
Substation, electric
|
5 – 10
|
|
Supermarkets
|
4 – 10
|
|
Town Halls
|
4 – 10
|
|
Taverns
|
20 - 30
|
|
Theaters
|
8 – 20
|
|
Transformer Rooms
|
12 – 60
|
|
Turbine rooms, electric
|
5 – 10
|
|
Warehouses
|
6 – 12
|
|
Waiting rooms, public
|
4
|
|
Welding Shop
|
12 - 60
|
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 Woodworking Shop
The fresh air supply to a wood working shop with volume 1000 m3 can be calculated as
Q = 5 (1/h) 1000 (m3)
= 5000 m3/h