Parallel and opposed blade louver dampers for airflow modulation in ID/FD fan inlets, boiler ducts & industrial ventilation — custom fabricated in Chennai.
Eshwa Engineering manufactures multi-louver dampers (also called multi-blade dampers or louver control dampers) for precise airflow control in industrial duct systems. Our louver dampers are installed in ID fan inlets, FD fan inlets, boiler air ducts, ESP bypass ducts, cement plant circuits, and process ventilation systems across India.
A multi-louver damper consists of multiple blades (louvers) arranged across the duct cross-section. All blades rotate simultaneously about their individual axes — providing modulating control of airflow from fully open to fully closed. Unlike a single-blade butterfly damper, multi-louver dampers handle large duct cross-sections with even flow distribution and lower pressure drop.
All blades move in the same direction simultaneously. Better for on/off isolation applications. When partially open, flow is directed at an angle — suitable for mixing applications. More commonly used in boiler air ducts and bypass applications.
Adjacent blades move in opposite directions. Provides more linear flow control characteristic — better for modulating applications where precise airflow regulation is needed. Used in ID fan inlet dampers, process flow control, and combustion air regulation.
Hand-lever operated with quadrant lock or worm gear for setting and locking blade position. Used for balancing air distribution systems, setting airflow to different duct branches, and infrequent adjustment applications.
Electric actuator (rotary or linear) for remote modulating control. Integrated with DCS / PLC for process control. Includes position feedback (4–20mA or digital). Used in power plant ID/FD fan control, boiler draft control, and cement plant circuits.
A special form of louver damper fitted at the fan inlet to control fan performance by pre-swirling the inlet air. More energy-efficient than outlet damper control. Used on large centrifugal fans — ID fans, FD fans, PA fans in power plants and process industries.
Frame: MS IS 2062 or SS as required
Blades: Aerofoil or flat section, MS / SS
Shaft: MS / SS with self-lubricating bearings
Linkage: External crank-arm linkage for synchronised blade movement
Sealing: Blade edge seals for low leakage
Temperature: Up to 350°C standard
| Parameter | Standard Range |
|---|---|
| Size Range | 500 mm × 500 mm to 4000 mm × 4000 mm |
| Blade Configuration | Parallel or Opposed blade |
| Number of Blades | 2 to 20+ depending on duct size |
| Blade Pitch | 200–300 mm centre to centre (standard) |
| Operating Temperature | Ambient to 350°C (higher on request) |
| Pressure Drop | Low — typically 10–50 Pa fully open |
| Material — Frame & Blades | MS IS 2062 / SS 304 / Alloy Steel |
| Actuation | Manual lever, Worm gear, Electric actuator, Pneumatic |
| Leakage Class | Class II to IV per AMCA 500 |
| Flange | Flat face flanged, drilled to IS / ANSI / custom |
Our multi-louver dampers are supplied to thermal power plants, gas-based power plants, cement plants (kiln, raw mill, coal mill exit ducts), steel plant sinter plants, chemical factories, paper mills, and co-generation plants. We have supplied to clients in Tamil Nadu, Andhra Pradesh, Karnataka, Maharashtra, Gujarat, Rajasthan, Odisha, Chhattisgarh, and West Bengal.
Custom-fabricated in Chennai and supplied to power plants, cement mills, and process industries across India.
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