Introduction: Eliminating Duct Corrosion in Fume Exhaust Systems
Industrial ventilation systems handling acid fumes, solvent vapors, and high humidity deteriorate rapidly when built with metallic or galvanized ducting. Fiberglass Reinforced Plastic (FRP) Ducting provides a continuous, lightweight, non-corrosive solution capable of enduring aggressive environments for over 25 years.
1. Duct Velocity & Sizing Best Practices
- Main Ducts: Design for 10 to 15 m/s (2,000 – 3,000 FPM) air velocity to prevent chemical condensation while keeping pressure drop low.
- Branch Ducts & Hoods: Design for 8 to 12 m/s (1,600 – 2,400 FPM) to ensure effective pollutant capture at the source.
2. Recommended Hanger Support Spacing
| Duct Inside Diameter (mm) | Max Horizontal Span (Meters) | Min Wall Thickness (mm) |
|---|---|---|
| 100 – 200 mm | 2.5 meters | 3.0 mm |
| 250 – 450 mm | 3.0 meters | 3.5 mm |
| 500 – 800 mm | 3.5 meters | 4.5 mm |
| 900 – 1200 mm | 4.0 meters | 6.0 mm |
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Nikunj Fibre Glass fabricates round and rectangular FRP ducting systems and exhaust blowers matching SMACNA standards.