Repair Systems — 07
Carpark Ventilation
Technical product reference for carpark ventilation fan and CO sensor systems for basement carpark ventilation compliance and upgrade on Australian Class 2 strata apartment buildings.
What are carpark ventilation systems?
Carpark ventilation systems are mechanical ventilation systems installed in enclosed and semi-enclosed basement carparks to manage carbon monoxide (CO) accumulation from vehicle exhaust. AS 1668.2 — The Use of Mechanical Ventilation and Air-Conditioning in Buildings — mandates mechanical ventilation for enclosed carparks in Australia. Without adequate ventilation, CO concentrations from vehicle exhaust can reach dangerous levels during peak usage periods, creating a life-safety hazard for occupants and building users. In Class 2 strata apartment buildings, basement carparks are commonly identified as deficient or non-compliant during OC inspections and building audits, requiring remediation or system upgrade.
Modern carpark ventilation systems typically operate on a demand-controlled basis using a carbon monoxide (CO) sensor. The sensor monitors CO concentration continuously; when CO rises to the trigger setpoint (typically 25 ppm per AS 1668.2), the controller activates the ventilation fan to exhaust contaminated air and introduce fresh air. The fan runs until CO drops to a safe level (typically below 10–15 ppm), then switches off. This approach reduces energy consumption significantly compared to continuous fan operation and is the current best practice for new and upgraded carpark ventilation installations. CO sensor setpoints must be confirmed and calibrated by a mechanical engineer at commissioning.
Carpark ventilation system design, including fan sizing, ductwork layout, CO sensor count, placement and setpoints, must be carried out by a mechanical engineer for each specific carpark. System commissioning and handover testing are required before the system is placed into service, and must be performed by a licensed mechanical contractor. Annual inspection and maintenance of CO sensors is required throughout the system life — electrochemical CO sensor cells typically have a service life of 3–5 years and must be replaced on schedule to maintain reliable CO detection and NCC compliance.
Do not confuse with:
- Residential exhaust fans — bathroom and kitchen exhaust fans (NCC Part F4 / AS 1668.2 domestic) — not designed for carpark CO management
- Subfloor ventilation — domestic underfloor ventilation for moisture control — not a carpark ventilation system
- Fire stair pressurisation — smoke control system for fire egress — a separate system from carpark ventilation, with different standards and commissioning requirements
Product Reference
1 product — 1 brand — carpark ventilation systems
Fantech Carpark Ventilation Fan and CO Sensor System
Centrifugal carpark ventilation fan with integrated CO sensor and controller
System Description
Fantech carpark ventilation systems consist of a high-volume centrifugal fan paired with a carbon monoxide (CO) sensor and a controller for demand-controlled operation in enclosed basement carparks. The CO sensor continuously monitors CO concentration; when CO levels rise to the trigger setpoint (typically 25 ppm), the controller activates the fan to exhaust contaminated air and draw in fresh air. The fan continues to run until CO drops to a safe level (typically below 10–15 ppm), then switches off or reduces to a low-speed duty cycle. This demand-controlled approach satisfies AS 1668.2 requirements while reducing energy consumption compared to continuous fan operation. System sizing — fan capacity, ductwork layout, supply and exhaust grille positions, CO sensor count and placement — must be designed by a mechanical engineer for each carpark. Commissioning, CO sensor setpoint calibration, and handover testing are required before the system is operational. Annual maintenance of CO sensors is mandatory as sensor electrochemical cells have a service life of typically 3–5 years and must be replaced on schedule to maintain compliance.
Technical Properties
- Centrifugal fan — high static pressure capability — suited to ducted carpark ventilation systems with bends and long duct runs
- Integrated CO sensor monitors carbon monoxide concentration — fan activates at user-set trigger setpoint (typically 25 ppm per AS 1668.2)
- Demand-controlled operation — fan runs only when CO exceeds setpoint — reduces energy consumption versus continuous operation
Limitations
- System must be designed by a mechanical engineer — fan sizing, duct layout, CO sensor placement and setpoints are not generic — each carpark requires a site-specific design
- CO sensor electrochemical cells have a limited service life (typically 3–5 years) — sensors must be replaced on schedule — expired sensors will not detect CO reliably
- Installation and commissioning must be carried out by a licensed mechanical contractor — system must be tested and commissioned before handover
PROCUREMENT SOURCES
Confirm suitability with the current manufacturer TDS before specifying or applying.
System Comparison
Technical comparison of carpark ventilation products. Confirm current product specifications with manufacturer TDS.
| Product | Brand | Type | Control | Trigger | Standard | Primary use |
|---|---|---|---|---|---|---|
| Fantech Carpark Ventilation Fan and CO Sensor System | Fantech | Centrifugal | CO sensor + controller | CO level (typically 25 ppm) | AS 1668.2 | Enclosed basement carpark — demand-controlled mechanical ventilation |
Brand Equivalents
Carpark ventilation system equivalents for Australian Class 2 strata remediation.
| System type | Fantech |
|---|---|
| Carpark ventilation fan + CO sensor | Carpark Ventilation System |
Engineering and compliance requirements
- Carpark ventilation must be designed by a mechanical engineer — system sizing, fan selection, CO sensor placement and setpoints all require engineering — do not size or specify without engineering sign-off
- CO sensor setpoints must comply with AS 1668.2 — typically fan activates at 25 ppm and runs until CO drops to a safe level — setpoints must be confirmed and calibrated at commissioning by the mechanical engineer
- System must be commissioned and tested by a licensed contractor before handover — commissioning includes verification of CO sensor response, fan activation, and air change rate under design conditions
- Annual inspection and maintenance of CO sensors is required — sensors have a service life of typically 3–5 years and must be replaced on schedule — expired sensors will not reliably detect CO and will not trigger fan operation
Disclaimer
Information is general only. Carpark ventilation system design must comply with AS 1668.2 and the NCC — system design and commissioning must be carried out by a mechanical engineer and licensed contractor. CO sensor placement and setpoints must be confirmed by a mechanical engineer. Do not rely on this reference as a substitute for professional engineering advice.