Duct Collar/Flange: Diameter Range 100mm to 2000mm

Component Specifications

Definition

A duct collar or flange is a standardized mechanical interface component designed to create secure, airtight connections between ductwork sections or between ducts and hood bodies/enclosures in industrial ventilation and exhaust systems. It typically consists of a circular or rectangular collar with bolt holes or clamping mechanisms that align with mating flanges on adjacent components, ensuring proper alignment and sealing to maintain system integrity and prevent air leakage.

Working Principle

The duct collar/flange works by providing a mating surface that aligns with corresponding flanges on duct sections or hood bodies. When bolted or clamped together with gaskets or sealants, it creates a continuous, airtight passage for airflow. The collar's design ensures proper alignment, distributes mechanical loads evenly, and maintains the structural integrity of the duct connection under operational pressures and vibrations.

Materials

Typically made from galvanized steel (G90 coating), stainless steel (304/316 grades), aluminum alloys, or composite materials. Thickness ranges from 1.2mm to 3.0mm depending on pressure requirements. Gaskets are often made from neoprene, silicone, or EPDM rubber for sealing.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bolt Circle	Standardized per flange size
Flange Type	Slip-on, Weld-neck, Blind, Lap-joint
Diameter Range	100mm to 2000mm
Surface Finish	Smooth, powder-coated, or galvanized
Pressure Rating	Up to 2500 Pa
Temperature Range	-40°C to 400°C

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 5801, DIN 24194, ASHRAE 120, SMACNA Duct Construction Standards

Parent Products

This component is used in the following industrial products

Hood Body/Enclosure

The main structural housing of a fume extraction hood that contains and directs airflow.

View Product Details

Engineering Analysis

Risks & Mitigation

Air leakage due to improper sealing
Corrosion in humid environments
Vibration-induced loosening of bolts
Thermal expansion mismatch
Improper alignment causing turbulence

FMEA Triads

Trigger: Insufficient bolt torque or missing gasket
Failure: Air leakage reducing system efficiency
Mitigation: Implement torque specifications, use proper gaskets, conduct pressure testing

Trigger: Corrosion from chemical exposure or humidity
Failure: Structural weakening and eventual breach
Mitigation: Select appropriate corrosion-resistant materials, apply protective coatings, implement inspection schedules

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±1.5mm on diameter, ±0.5mm on bolt hole alignment, flatness within 0.8mm/m

Test Method

Pressure decay test per ISO 5801, leak detection with smoke or ultrasonic testing, visual inspection for defects

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

Check the legal entity, factory address, ownership, certifications, and direct contacts.

Compare the published product scope and source details, then include your specifications and quantity in an enquiry.

Manufacturers of Duct Collar/Flange

Manufacturer profiles associated with Duct Collar/Flange.

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Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review

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Frequently Asked Questions

What is the difference between a duct collar and a duct flange?

A duct collar typically refers to a short cylindrical extension with a rolled edge for slip-on connections, while a flange is a flat, bolted interface with standardized bolt patterns. Collars are often used for flexible connections, while flanges provide rigid, high-pressure connections.

How do I select the right gasket material for a duct flange?

Select gasket material based on temperature range, chemical exposure, and pressure requirements. Neoprene for general use (-40°C to 100°C), silicone for high temperatures (-60°C to 230°C), and EPDM for weather resistance and chemical compatibility.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Duct Collar/Flange