- (01-21) -
4-3. METHODS OF VENTILATION
mechanical power.
NATURAL VENTILATION
derived from external winds and
the outdoor and indoor temperature
ventilation is weaker than mechanical
MECHANICAL VENTILATION
Methods of mechanical ventilation
ventilation with ventilating fans and air
ventilation.
*
remain in negative pressure to prevent
contaminated air from leaking into
adjacent rooms and corridors (Class 1 or
to prevent intrusion of contaminated air
(Class 2 Ventilation).
Total ventilation and local ventilation
Total ventilation
This ventilation is designed for an
entire house and for exchanging
the entire air in the house (Fig.
3-5).
ventilation required for multiple rooms and the entire
Natural air
exhaust
Natural air
supply
A
ir exhaust
A
ir supply
(Natural
ventilation)
Fig. 3-1
Warehouses, gymnasiums, factories
where hot air is generated
Class 1 Ventilation Method
Exhaust Mechanical
exhaust
A
ir
supply
Mechanical air
supply
Indoor
Ventilating fan
Exter-
nal air
Ventilating
fan
To be applied for buildings, indoor parking
lots, boiler rooms, electric rooms, machine
rooms
,
kitchens
,
and warehouses
,
etc.
Fig. 3-2
A
A
g
g
Class 2 Ventilation Method
Exhaust Mechanical
exhaust
A
ir
supply
Mechanical air
supply
A
Exter-
nal air
Positive
pressure
Exhaust
outlet
Indoor
Ventilating fan
Fi
g
. 3-3
g
To be applied for clean rooms and cooling
machinery, etc.
Class 3 Ventilation Method
Exhaust
Mechanical
exhaust
A
ir
supply
Mechanical air
supply
Exter-
nal air
Indoor
Negative
pressure
Air supply
inlet
Ventilating
fan
Fi
g
. 3-4
To be applied for kitchens, toilets, rooms where hot-water
heaters can be utilized in residences, and copying
rooms, etc.
Air
supply
Contami-
nated air
Ex-
haustFig. 3-5
Local ventilation
house (rooms or parts).
a) Local exhaust
Local exhaust is performed for particular places in which
This kind of ventilation is applied
a) Room ventilation
ventilation.)
Cooking o
hood fan
ven
The range
covered b
y
ventilation
Exhaust
Oven
Fig. 3-6
