China Air Duct Manufacturers Suppliers Factory - Buy Discount Air Duct for Sale

Product Overview

Our industrial flexible air ducts are designed for HVAC air distribution, ventilation, exhaust, fume extraction, and OEM equipment air routing. The duct construction combines a flexible inner membrane with a spring steel wire helix to provide controlled flexibility and structural support during installation.

Depending on the application, available constructions can include aluminum-based, PVC-coated, TPU, silicone, insulated, and other material configurations. Material selection should be based on operating temperature, conveyed media, pressure or vacuum conditions, abrasion requirements, installation environment, and applicable safety requirements.

Adjustable Ceiling Air Diffuser
With 26 years of experience in HVAC terminal equipment manufacturing, our factory operates a 20,000 m² production facility supported by an 8-person dedicated R&D team. The Adjustable Ceiling Air
Aluminum Single Deflection Supply Grille
With 26 years of experience in HVAC terminal component manufacturing, our factory operates a 20,000 m² production facility supported by an 8-person dedicated R&D team. The Aluminum Single Deflection
Aluminum Double Deflection Air Grille
With 26 years of experience in HVAC air distribution terminal manufacturing, our factory operates a 20,000 m² production facility with an 8-person dedicated R&D team. The Aluminum Double Deflection
Aluminum Double Deflection Supply Grille With Damper
With 26 years of experience in HVAC air distribution terminal manufacturing, our factory operates a 20,000 m² production facility supported by an 8-person R&D engineering team. The Aluminum Double
Motorized Airflow Control Damper
With 26 years of experience in HVAC and ventilation equipment component manufacturing, our factory operates a 20,000 m² production facility with an 8-person dedicated R&D team. The Motorized Airflow
Manual Parallel Blade Air Volume Damper
With 26 years of experience in HVAC and ventilation component manufacturing, our factory operates a 20,000 m² production facility supported by a dedicated 8-person R&D team and complete sheet metal
280 Degree Smoke Exhaust Damper
With 26 years of experience in HVAC terminal and fire ventilation component manufacturing, our factory has a 20,000 m² production facility and an 8-person dedicated R&D team. The 280 Degree Smoke
280 Degree Smoke Fire Damper
With 26 years of experience in HVAC fire and smoke control component manufacturing, our factory operates a 20,000 m² production facility supported by a dedicated 8-person R&D engineering team. The
70 Degree Fire Smoke Damper
With 26 years of experience in HVAC fire and smoke control component manufacturing, a 20,000 m² self-owned production facility, and an 8-person dedicated R&D team, the 70 Degree Fire Smoke Damper is
Stainless Steel HVAC Ductwork
With 26 years of experience in ventilation duct manufacturing, a 20,000 m² self-owned production facility, and an 8-person dedicated R&D team, we are equipped with a complete range of sheet metal
XPS Insulated Metal Composite Air Duct
With 26 years of experience in HVAC ventilation product manufacturing, our factory operates a 20,000㎡ production facility supported by an 8-person dedicated R&D team. The XPS Insulated Metal
Galvanized Steel HVAC Ductwork
With 26 years of experience in HVAC ventilation duct manufacturing, our factory operates a 20,000㎡ production facility with an 8-person dedicated R&D team and complete sheet-metal processing

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Product Configuration and Construction

The duct structure can be configured according to the intended operating conditions and material requirements.

Inner Liner: Available constructions include aluminum foil, PVC-based materials, TPU, silicone, and other application-specific materials. The selected liner determines the duct temperature, abrasion, chemical, and environmental compatibility.

Spring Steel Wire Helix: A formed spring steel wire reinforcement supports the duct wall and allows the duct to bend around equipment, structures, and other installation obstacles.

Insulation Layer: Insulated versions can incorporate a fiberglass or other thermal insulation layer to reduce heat transfer and help control condensation where the duct passes through unconditioned spaces.

Outer Jacket: Depending on the construction, the outer layer can provide mechanical protection, moisture resistance, or vapor-barrier functionality.

Connection Options: End configurations can be adapted for clamps, collars, flanges, or other connection methods according to the installation requirements.

Key Features

01/

Flexible Installation: The spring-supported construction allows the duct to follow curved installation routes and connect equipment positioned at different angles.

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Structural Support: The wire helix helps the duct retain its cross-sectional shape during normal handling, bending, and specified operating conditions.

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Application-Specific Materials: Different liner and jacket materials are available for temperature, abrasion, moisture, static-control, and other application requirements.

04/

Insulated Construction: Insulated versions are available for applications where thermal transfer and condensation control are considerations.

05/

Compact Packaging: Flexible ducts can be compressed for packaging and transportation. The actual compression ratio depends on duct construction, diameter, length, and packaging configuration.

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Custom Configuration: Diameter, length, material construction, insulation, reinforcement, and outer marking can be customized subject to production requirements.

Technical Specifications

Parameter	Specification
Available Diameters	Custom and standard sizes available; confirm required range
Standard Length	Available in specified production lengths; confirm required length
Inner Liner Materials	Aluminum, PVC-based, TPU, silicone, and other available constructions
Reinforcement	Spring steel wire helix
Insulation	Available on selected insulated constructions
Outer Jacket	Material varies by product construction
Operating Temperature	Depends on liner and overall construction; confirm for selected model
Working Pressure	Depends on diameter and construction; confirm product-specific rating
Vacuum Rating	Depends on diameter, reinforcement, and construction; confirm product-specific rating
Recommended Air Velocity	Confirm according to duct construction and application
Flame Performance	Available according to selected material construction and applicable test requirements
Anti-Static Construction	Available for applications requiring static-control properties
Connection Method	Clamps, collars, flanges, or customized connection arrangements

Applications

Commercial HVAC and Ventilation: Used for supply, return, exhaust, and equipment connections in commercial and institutional ventilation systems. The appropriate material and construction should be selected according to airflow, temperature, installation conditions, and applicable project requirements.

Industrial Exhaust and Fume Extraction: Flexible ducting can be used to route exhaust air, process fumes, and other non-liquid air streams where the selected duct material is compatible with the conveyed media and operating conditions.

Dust Collection and Workshop Ventilation: Heavy-duty constructions can be configured for selected dust and particle extraction applications. Material selection should consider particle size, abrasion level, airflow, pressure or vacuum, and the required service conditions.

OEM Equipment: Flexible ducts can be integrated into drying equipment, environmental chambers, ventilation assemblies, agricultural equipment, and other machinery requiring flexible air routing.

Equipment Connections: Flexible sections can be used between fixed ductwork and equipment to accommodate installation geometry and equipment movement where permitted by the system design.

Manufacturing and Quality Control

Production processes are selected according to the duct material and construction, including film or fabric preparation, lamination or bonding, spring-wire forming, helical winding, cutting, end finishing, and packaging.
Quality control can include the following procedures:

Raw Material Inspection:

Incoming materials can be checked for relevant properties such as thickness, dimensions, appearance, and material identification according to the applicable specification.

Construction Inspection:

Finished duct dimensions, wire spacing, wall construction, insulation thickness, and other specified characteristics are checked against production requirements.

Seam and Bond Inspection:

Bonded or laminated areas are inspected according to the applicable material and production process.

Pressure and Vacuum Testing:

Selected products can be evaluated under specified pressure or vacuum conditions where such testing is part of the product specification.

Dimensional Inspection:

Diameter, length, wall construction, and other critical dimensions are checked during production and final inspection.

Batch Traceability:

Production records can be maintained according to the manufacturer internal quality-control and traceability procedures.

OEM and Customization

We support OEM and project-based requirements for flexible air ducting. Available customization may include:
Diameter: Standard or non-standard metric and imperial sizes
Length: Customized production lengths according to project requirements
Material: Aluminum, PVC-based, TPU, silicone, and other available constructions
Reinforcement: Wire diameter and pitch according to the required construction
Insulation: Insulated and non-insulated configurations
Outer Layer: Application-specific protective or vapor-barrier constructions
Static-Control Options: Anti-static materials for applications requiring controlled electrical resistance, subject to technical confirmation
Printing and Identification: Product codes, length markings, labels, and other identification requirements
Packaging: Compression packaging and customized carton or pallet configurations

FAQ

Q: How do I select the right flexible air duct material?

A: Material selection depends on operating temperature, conveyed media, abrasion, pressure or vacuum, installation environment, and applicable safety requirements. Aluminum, PVC-based, TPU, silicone, and insulated constructions should be evaluated according to the actual operating conditions rather than selected by material name alone.

Q: What information should I provide when requesting a quotation?

A: Please provide the required diameter, length, airflow, operating temperature, positive or negative pressure, conveyed media, installation environment, insulation requirement, connection method, quantity, and any applicable project standards or certification requirements.

Q: Can the duct be used for negative-pressure extraction?

A: Selected reinforced constructions can be designed for negative-pressure applications. The allowable vacuum level depends on duct diameter, wire reinforcement, wall construction, and other design factors. The applicable vacuum rating should be confirmed for the specific product configuration.

Q: Do you offer insulated flexible air ducts?

A: Yes. Insulated constructions are available for applications where thermal transfer or condensation control is a consideration. Insulation material and thickness should be selected according to the operating temperature and installation environment.

Q: Can you provide anti-static or special-material ducting?

A: Application-specific anti-static and special-material constructions may be available. Suitability depends on the conveyed material, temperature, pressure or vacuum, grounding requirements, chemical exposure, and applicable regulations. Required electrical-resistance data and compliance requirements should be confirmed before specification.

Q: What quality and technical documents can be provided?

A: Depending on the product and project requirements, available documentation may include product specifications, material information, inspection records, test reports, and compliance documentation. The applicable documents should be confirmed for the selected duct construction before order placement.

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