Industrial Ducts

Industrial Ducts

Air Handling & Pollution Control

Industrial Ducts

Industrial ducts are engineered pipelines designed for conveying air, fumes, dust, vapors, gases, or particulates across process equipment. They form part of air-handling, dust collection, ventilation, and pollution control systems in industries such as chemical, pharmaceutical, food, textile, cement, HVAC, and foundries.

Ducts may be round, square, or rectangular, depending on application, and are fabricated using various materials such as GI, MS, SS304/316, aluminum, or FRP. They are designed considering airflow, static pressure, temperature, corrosion resistance, and mechanical strength.

A. Materials of Construction (MOC)

Material	Application
GI (Galvanized Iron)	HVAC, general ventilation
MS (Painted / Epoxy coated)	Industrial dust/fume extraction
SS304 / SS316 / SS316L	Food, pharma, corrosive fumes
FRP/PP/HDPE	Acidic/corrosive exhaust
Aluminum	Lightweight, clean room HVAC

B. Duct Types

Round Ducts – best for low pressure drop and high airflow efficiency
Rectangular/Square Ducts – used in space-restricted installations
Spiral Ducts – rigid, aesthetic, HVAC applications
Flexible Ducts – short connection lengths, low pressure systems
Insulated Ducts – for hot/cold air transport

C. Size & Thickness

Parameter	Specification
Diameter (round)	100 mm to 2,000+ mm
Size (rectangular)	200×200 mm to 3,000×2,000 mm
Sheet Thickness	0.6 mm to 6 mm (GI/MS/SS)
FRP Laminate	2 mm to 8 mm thick

D. Design Parameters

Parameter	Typical Values
Design Air Velocity	10–20 m/s (dust extraction) 4–8 m/s (HVAC)
Static Pressure	25 to 3000 Pa (depending on system)
Temperature	Ambient to 300°C (MS/SS), 80–120°C (FRP)
Pressure Class	Low / Medium / High pressure ducts

E. Fabrication Standards

SMACNA standards (HVAC ducts)
ASME section for industrial ducting
Hot dip galvanized or epoxy painted finish
Continuous welded or lock-formed joints

F. Duct Components

Straight ducts
Elbows (30°, 45°, 90°)
Reducers
Dampers (volume/guillotine/butterfly)
Tees, wyes, laterals
Flanges (MS/SS)
Expansion joints (rubber/fabric)
Access doors for cleaning

G. Support & Installation

Parameter	Specification
Supports	Hangers, bracings, U-clamps, saddles
Support Material	MS hot-dip galvanized / SS
Spacing	1.5 m to 3 m depending on size
Sealing	Silicone, neoprene gaskets, sealants

H. Surface Protection

Epoxy paint (chemical plants)
High-temperature paint (boilers/exhaust)
PU or vinyl ester lining (acidic fumes)
Food/pharma grade polish for SS ducts

I. Optional Features

Insulation with rock wool / nitrile rubber
Sound attenuation lining
Fire-rated ducts (2–3 hours)
Leak-proof high-pressure construction
Corrosion-resistant FRP/PP-FRP ducts
Flexible connectors for vibration isolation

A. Materials of Construction (MOC)

Material	Application
GI (Galvanized Iron)	HVAC, general ventilation
MS (Painted / Epoxy coated)	Industrial dust/fume extraction
SS304 / SS316 / SS316L	Food, pharma, corrosive fumes
FRP/PP/HDPE	Acidic/corrosive exhaust
Aluminum	Lightweight, clean room HVAC

B. Duct Types

Round Ducts – best for low pressure drop and high airflow efficiency
Rectangular/Square Ducts – used in space-restricted installations
Spiral Ducts – rigid, aesthetic, HVAC applications
Flexible Ducts – short connection lengths, low pressure systems
Insulated Ducts – for hot/cold air transport

C. Size & Thickness

Parameter	Specification
Diameter (round)	100 mm to 2,000+ mm
Size (rectangular)	200×200 mm to 3,000×2,000 mm
Sheet Thickness	0.6 mm to 6 mm (GI/MS/SS)
FRP Laminate	2 mm to 8 mm thick

D. Design Parameters

Parameter	Typical Values
Design Air Velocity	10–20 m/s (dust extraction) 4–8 m/s (HVAC)
Static Pressure	25 to 3000 Pa (depending on system)
Temperature	Ambient to 300°C (MS/SS), 80–120°C (FRP)
Pressure Class	Low / Medium / High pressure ducts

E. Fabrication Standards

SMACNA standards (HVAC ducts)
ASME section for industrial ducting
Hot dip galvanized or epoxy painted finish
Continuous welded or lock-formed joints

F. Duct Components

Straight ducts
Elbows (30°, 45°, 90°)
Reducers
Dampers (volume/guillotine/butterfly)
Tees, wyes, laterals
Flanges (MS/SS)
Expansion joints (rubber/fabric)
Access doors for cleaning

G. Support & Installation

Parameter	Specification
Supports	Hangers, bracings, U-clamps, saddles
Support Material	MS hot-dip galvanized / SS
Spacing	1.5 m to 3 m depending on size
Sealing	Silicone, neoprene gaskets, sealants

H. Surface Protection

Epoxy paint (chemical plants)
High-temperature paint (boilers/exhaust)
PU or vinyl ester lining (acidic fumes)
Food/pharma grade polish for SS ducts

I. Optional Features

Insulation with rock wool / nitrile rubber
Sound attenuation lining
Fire-rated ducts (2–3 hours)
Leak-proof high-pressure construction
Corrosion-resistant FRP/PP-FRP ducts
Flexible connectors for vibration isolation

Robust industrial construction
Low maintenance
Energy efficient

Applications and industry use-cases for this product are described here.

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