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CHAPTER 1
Ventilation for Healthy Living
3.2 Comparison of ventilation methods
There are two main types of ventilation methods.
Centralized ventilation method
This is mainly used in large buildings, with the fresh outdoor air intake being installed in one machine room. For this method,
primary treatment of the fresh outdoor air, such as heat recovery to the intake air and dust removal is performed being
distribution to the building by ducts.
Independent zoned ventilation method
This is mainly used in small to medium sized buildings, with areas being ventilated using fresh outdoor air intakes formed of
independent ventilation devices. The rate of use of this method has recently increased as independent control is becoming
ever more feasible.
Centralised ventilation method
Air intake
(fresh out-
door air)
Filters
Lossnay
Each unit
6
Independent zoned ventilation method
1) System operation with cassette-type air conditioner
Exhaust
Air exhaust
(stale air)
Supply fan
2) System operation with ceiling embedded-type air conditioner
3) Independent operation with ceiling suspended-type air conditioner
Cassette-type or ceiling suspended-type
package air conditioner or fan coil unit
Cassette-type package air
conditioner or fan coil unit
Ceiling embedded-type package
air conditioner or fan coil unit
Ceiling recessed-
Exhaust grill
type Lossnay
Exhaust air
Fresh outdoor air
Finished ceiling
Ceiling recessed-
Exhaust grill
type Lossnay
Exhaust air
Fresh outdoor air
Finished ceiling
Ceiling-mounted type Lossnay or
ceiling embedded-type Lossnay
Fresh outdoor air
Exhaust air
Finished ceiling
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