The volume of fresh air (make up air) required for proper ventilation is determined of the size and use of the space.
The table below indicates recommended air change rates (air rates (air changes per hour) in some common types of rooms and buildings:
Building !oom
"ir #hange !ates !ates -n(1/hr)
"ll spaces in general general
min $
"ttic spaces for cooling cooling
%& ' %
"uditoriums
' %
Bakeries
&*
Banks
$ ' %*
Barber +hops
, ' %*
Bars
&* ' -*
Beauty +hops
, ' %*
Boiler rooms
% ' &*
Bowling "lleys
%* ' %
#afeterias
%& ' %
#hurches
' %
#lub rooms
%&
#lubhouses
&* ' -*
#ocktail ounges
&* ' -*
#omputer !ooms
% ' &*
#ourt /ouses
$ ' %*
0ental #enters
' %&
0epartment +tores
, ' %*
0ining /alls
%& '%
0ining rooms (restaurants)
%&
0ress +hops
, ' %*
0rug +hops
, ' %*
1ngine rooms
$',
2actory buildings3 ordinary
&'$
2actory buildings3 fumes and moisture
%* ' %
2ire +tations
$ ' %*
2oundries
% ' &*
4alvanizing plants
&* ' -*
4arages repair
&* ' -*
4arages storage
$',
/omes3 night cooling
%* ' %
5ewelry shops
, ' %*
6itchens
% ' ,*
aundries
%* ' %
ibraries3 public
$
unch !ooms
%& '%
uncheonettes
%& '%
7ightclubs
&* ' -*
8alls
, ' %*
8edical #enters
' %&
8edical #linics
' %&
8edical 9ffices
' %&
8ills3 paper
% ' &*
8ills3 tetile general buildings
$
8ills3 tetile dye houses
% ' &*
8unicipal Buildings
$ ' %*
8useums
%& '%
9ffices3 public
-
9ffices3 private
$
;olice +tations
$ ' %*
;ost 9ffices
$ ' %*
;recision 8anufacturing
%* ' *
;ump rooms
!estaurants
' %&
!etail
, ' %*
+chool #lassrooms
$ ' %&
+hoe +hops
, ' %*
+hopping #enters
, ' %*
+hops3 machine
+hops3 paint
% ' &*
+hops3 woodworking
+ubstation3 electric
' %*
+upermarkets
$ ' %*
Town /alls
$ ' %*
Taverns
&* ' -*
Theaters
' %
Turbine rooms3 electric
' %*
&
$
7ote 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=nV
(1)
where q = fresh air supply (ft 3 /h, m3 /h) n = air change rate (1/n) V = volume of room (ft 3, m3 )
