Spray Booth Ventilation Solution for Multi-Branch Exhaust Balance with POPULA 9-19 Fans
A reliable spray booth ventilation solution must do more than remove air at one main outlet. In a multi-station spray area, branches closest to the fan can draw too strongly while remote branches receive too little extraction. As elbows, long duct runs and filter stages add resistance, airflow becomes harder to balance and the required negative pressure at each work area may not be maintained.
POPULA approaches this duty as a system problem: confirm the required extraction volume at every station, calculate the full resistance of ducts and filters, then select a fan with enough pressure margin for the designed operating point. For high-resistance applications, the 9-19 high-pressure centrifugal fan provides the pressure capability needed to support a properly engineered multi-branch exhaust arrangement.
Important application note: the standard 9-19 series is specified for non-corrosive, non-self-igniting gas with no sticky material, a dust concentration not exceeding 150 mg/m³ and gas temperature not higher than 80°C. If the spraying process can create flammable solvent vapour, the entire ventilation system must be specified for the site hazard assessment, including an appropriate explosion-proof configuration where required.
Spray Booth Ventilation Solution for Multi-Branch Exhaust Balance
The layout begins by placing extraction points near each spray station and connecting them to a main duct through separate branch runs. Every branch should include a balancing damper so the installer can reduce excessive flow at short, low-resistance runs and direct the designed airflow to longer or more complex runs. This is the practical way to correct the familiar pattern of strong near-end suction and weak far-end extraction.
System resistance must include straight duct friction, elbows, transitions, hoods, dampers, filters and discharge components. Filter pressure loss should not be treated as a fixed number: it changes as the filter loads. The final fan selection should therefore be based on the calculated system curve and the expected clean and operating filter conditions, rather than on nominal airflow alone.
Why Choose a POPULA 9-19 High-Pressure Centrifugal Fan
The 9-19 series is designed for high-pressure industrial ventilation duty where ordinary low-pressure fans may not maintain the required airflow once duct and filter resistance are included. As a reference point, the 9-19-6.3A model covers 697–5,690 m³/h with total pressure of 8,148–8,857 Pa. The actual model must be selected from the required system airflow and total resistance calculation.
A-style direct drive and D-style coupling drive options allow the equipment arrangement to be matched to the maintenance plan. Where operating conditions require adjustment, a correctly specified variable-frequency arrangement can provide operating flexibility; the final motor, drive, electrical protection and control strategy should be confirmed for the project.
How the Exhaust System Maintains Stable Negative Pressure
Install the 9-19 fan at the discharge end of the exhaust system so it draws air through the branch network and filter stages. Keep unnecessary elbows and abrupt transitions to a minimum, provide access for filter replacement, and commission each balancing damper after the complete system is running. Record the damper settings and baseline pressure readings so future maintenance teams can identify changes caused by filter loading or process adjustments.
Maintenance and Future Expansion
A system designed for access is easier to keep stable. Schedule inspections of filters, duct joints, vibration, drive components and airflow indications. If future stations may be added, reserve appropriate space in the duct layout and review the fan operating point before expansion rather than assuming the original unit can absorb extra resistance.
With its industrial fan range and project-based selection support, POPULA helps customers align airflow, pressure, installation layout and practical maintenance needs. Explore POPULA industrial ventilation solutions or visit the POPULA Fan homepage to discuss a spray booth exhaust configuration for your application.