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MECHANICAL VENTILATION SYSTEM FOR ACCEPTABLE INDOOR AIR
QUALITYFOR A CAR PARK.
Use of Building: Car Park and Apartments Class of Building: 2
& 7aRise in Storeys: 2 No. of Storeys: 2
Total Floor Area: 360m2 Car park only Works Commenced: No
Background
A building notice was issued by the Municipal Building Surveyor
on the owner of the
subject property. The notice identified that the building car
park mechanical ventilationsystem was deficient in that the exhaust
fumes from the vehicles within the car park werecausing a nuisance
to the surrounding adjoining properties. To satisfy the building
notice,the owner engaged a mechanical engineer to design an
appropriate mechanical exhaustsystem for this 13-space car park.
The engineer designed a system with minordepartures from the code
requirements due to the existing building design and
itsconstraints.
Nature of Modification No. 1
To permit the car park mechanical exhaust discharge point to be
located less than 6metres from ventilation openings in the
building.
Nature of Modification No. 2
To permit the car park mechanical exhaust system to have exhaust
air drawn into the airintakes at high level only, as the car park
finished floor level is 300mm below the streetlevel.
Legislative Requirements
Performance Requirement: FP4.4 & FP4.5
Deem-to-Satisfy Provisions: F4.11 (Inter alia AS1668.2 Clause
4.11)
FP4.4
A mechanical air handling system installed in a building must
control -(a) the circulation of objectionable odours; and(b) the
accumulation of harmful contamination by micro-organisms,
pathogens and toxins.
FP4.5
Contaminated air must be disposed of in a manner which does not
unduly create anuisance or hazard to people in the building or
other property.
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Applicants Supporting Reasons
The applicant submitted the following in respect of the
application:
The building is 80 years old and in 1993 it was fully
refurbished and converted intoapartments and car park.
There are limitations in which the front faade could be
penetrated for the dischargepoint to the street alignment without
major disturbance to the existing building.
The discharge point for exhaust will be above the existing
roller door and within 6metres of the surrounding openings of the
building.
The car park has spaces for 13 cars for residential use
only.
Car movements are expected to be low.
The car park exhaust system is to have high-level exhaust only
to simplify theexhaust arrangements due to the car park being 1.2
metres below the street level.
Any odours or contamination that may be in the air stream
adjacent the dischargepoint will be similar to or no worse than the
situation of a car or van driving down thestreet. Such a system is
very unlikely to provide a case for nuisance.
Comments
The relevant building surveyor was consulted and offered no
objection to the proposal.
BAB Determination No.1
Approved.
BAB Determination No.2
Approved.
Supporting information attached with application
These plans were provided by the applicant to illustrate the
design of the mechanicalventilation system.
