The Problem with Fixed-Speed Extraction Systems
In most Australian manufacturing and joinery workshops, extraction systems run continuously at 100% capacity from morning startup to afternoon shutdown, regardless of whether 3 machines or 30 machines are actively operating. Because fan power follows the cubic affinity law (Power ∝ RPM³), running a 75 kW blower motor at full speed when only partial airflow is needed wastes tens of thousands of dollars in annual electricity costs.
Dynamic Demand-Based VFD Control
By implementing an automated ADFC EcoFlow Variable Air Volume (VAV) System, individual machines are equipped with automated pneumatic blast gates and current-sensing CT relays. When a CNC router or saw is powered on, its dedicated blast gate opens; when powered off, the gate closes smoothly.
- Main Duct Static Pressure Sensing: High-precision differential pressure transducers in the main trunk line detect pressure changes instantly.
- Modulating VFD Inverter: The central PLC adjusts fan motor RPM to maintain exact target duct velocity (typically 20 m/s transport speed) without pulling surplus air.
- Documented Energy Reductions: Facilities typically experience a 35% to 48% reduction in total kWh energy consumption, resulting in capital payback within 14 to 22 months.
“Under the cubic fan affinity law, reducing motor speed by just 20% slashes electrical power draw by nearly 50%—delivering immediate operational cost savings and reducing your facility carbon footprint.”
