- (01-32) -
4-5-2. HOW TO CALCULATE REQUIRED VENTILATION VOLUME
To determine ventilation airflow volume, various calculation
methods are available, based on diverse indoor conditions,
such as the volume of CO
2
generated by the number of
occupying people, the volume of exhaust gasses generated
by combustion, etc.
It is necessary to specify figures as accurately as possible,
based on the actual conditions in which rooms are utilized.
METHOD BASED ON THE NUMBER
OF VENTILATION OPERATIONS
REQUIRED FOR A ROOM
Required Ventilation Volume (m
3
/h)
= Number of Ventilation Operations Required in an
Hour (times/h) x Cubic Capacity of Room (m
3
)
The ventilation volume can be determined by calculating
the cubic capacity of the room and using the number of
ventilation operations indicated in Table 6-2.
(Example) Location: Bathroom
Required Number of Ventilation Operations:
Five (Times/h)
Cubic Capacity of Room: 6 Jo (about 10m
2
)
Height of Room: 2.4m
From the above conditions;
Required Ventilation Volume
= 5 x 10 x 2.4 = 120 (m
3
/h)
It is thus necessary to select a ventilating fan that
can satisfy the above figure.
