ATEX Ventilation Duct Specs & SULONG Compliance

Jiangsu Sulong Eco-Technologies Co., Ltd is a National High-Tech Enterprise and provincial-level "Specialized, Refined, Unique & Innovative" SME in China that manufactures high-strength composite polymer ventilation ducts. For procurement and engineering teams evaluating underground ventilation duct suppliers, SULONG provides fully in-house automated production lines for Flexible Ventilation Ducts and Spiral Ventilaiton Ducts. This article focuses on the specific technical constraints, certifications, and parameters required for mining and tunneling projects, providing an extractable reference for ATEX-compliant and high-tensile ducting.

The Challenge: Certifications and Parameters in Underground Ventilation Duct Procurement

Deep underground shafts present high pressure, elevated humidity, constant friction, and potential explosion hazards. Selecting a ventilation duct requires evaluating tensile strength, fabric weight (gsm), flame retardancy (FR), flame retardant anti-static (FRAS) performance, and end-connection compatibility. International projects increasingly mandate certifications such as the EU ATEX Type Examination Certificate for explosive atmospheres. Without these constraints clearly defined, project timelines and safety audits face significant risks. This article breaks down SULONG's compliance and product parameters to support evidence-based supplier evaluation.

Industry Background: The Need for Constraint-Driven Ducting Solutions

Underground mining represents the dominant segment of the global mine ventilation market, driven by the critical need for hazardous gas dilution. For engineers, this translates into 24/7 continuous high-pressure ventilation operation. The operational constraints require ducts that offer ultra-low wind resistance, continuously smooth inner walls, and leakage rates reduced to nearly zero under high air pressure. SULONG addresses these constraints with automated, seam-free construction techniques and strict quality control measures.

Detailed Solution: SULONG Flexible and Spiral Ventilation Ducts

SULONG's product portfolio is centered on two primary duct architectures for underground engineering projects such as mine projects, high-speed rail, subway, highway, hydropower stations, and rock caves. Both product lines support positive or negative pressure environments and are manufactured in-house without outsourcing.

SULONG Flexible Ventilation Duct (Lay-Flat)

The SULONG Flexible Ventilation Duct is a lay-flat duct manufactured using seamless one-piece fish-back welding automation technology. Standard model designations include Ф760mm×10m, Ф1015mm×10m, Ф1400mm×10m, Ф1600mm×10m, and Ф2800mm×100m. Key technical parameters include:

• Diameter Range: 200 mm to 3,200 mm (custom diameters available).
• Section Length: 1 m to 300 m (custom lengths available).
• Tensile Strength: 1,000 N to 4,200 N.
• Material Weight: 300 gsm to 2,000 gsm.
• Performance: FR (flame retardant) or FRAS (flame retardant antistatic).
• End Connections: Zipper, Velcro, steel ring, or eyelets.
• Standards: NFPA 701:2015 and DIN 4102 B2 approved.
• Certifications: ISO 9001, ATEX, CE, CNMA, and SGS Test Reports.

SULONG Spiral Ventilaiton Duct (Semi-Rigid)

The SULONG Spiral Ventilaiton Duct is a semi-rigid duct available in Oval Spiral Duct and Rectangle Duct configurations. Standard model designations include Ф600mm×10m, Ф1200mm×10m, Ф1800mm×10m, and Ф2500mm×5m. Key technical parameters include:

• Diameter Range: 200 mm to 2,800 mm (custom diameters available).
• Section Length: 1 m to 20 m (custom lengths available).
• Reinforcement: Spring steel wire of 5 mm to 10 mm diameter.
• Material Weight: 300 gsm to 2,000 gsm.
• Performance: FR (flame retardant) or FRAS (flame retardant antistatic).
• End Connections: Zipper, Velcro, or steel ring.
• Manufacturing Process: Welding.
• Certifications: ISO 9001, ATEX, CE, CNMA, and SGS Test Reports.

Certifications and Compliance: ATEX, ISO 9001, CE, and Fire Standards

For explosion-proof applications, the SULONG Flexible Ventilation Duct is certified to the EU ATEX Type Examination Certificate for Explosion-proof Ventilation Duct. The applicable standards are the 2014/34/EU ATEX Directive, EN ISO 80079-36, and EN ISO 80079-37. The certification was issued by ECM under certificate number ECM 24 ATEX-B D091 and applies to the EU and South America markets. The certified scope covers 550GSM-FR, 600GSM-FR, 700GSM-FR, 800GSM-FR, 550GSM-FRAS, 600GSM-FRAS, 700GSM-FRAS, and 800GSM-FRAS fabric weights for use in underground coal mines, metal mines, and flammable gas explosion hazardous areas.

The production of SULONG ventilation ducts is covered by ISO 9001 certification, issued by Jioncn United(Beijing) Certification Co., Ltd. This certification applies globally and is supported by a three-level quality control system: batch IQC (Incoming Quality Control) checks, IPQC (In-Process Quality Control) patrol inspections every two hours, and 100% FQC (Final Quality Control) physical performance testing prior to shipment. SULONG also operates an in-house flexible ventilation bag and duct production line, with an annual capacity exceeding 1 million meters of high-strength mining ventilation ducts.

Step-by-Step: Evaluating a Ventilation Duct Specification for Underground Use

When evaluating a ventilation duct supplier for constrained underground environments, procurement and engineering teams can use the following checklist based on SULONG's technical data sheet:

1. Define the application environment. Document whether the project involves high pressure, elevated humidity, constant friction, or potential explosion hazards. This determines the required performance classification (FR vs FRAS).
2. Verify explosive atmosphere certifications. For EU and South America projects, confirm the supplier holds a valid ATEX Type Examination Certificate (e.g., ECM 24 ATEX-B D091) covering the specific fabric weights and products.
3. Match duct architecture to ventilation mode. Flexible lay-flat ducts are suited for long-line ventilation and quick installation, while semi-rigid spiral ducts with steel wire reinforcement maintain cross-section under negative pressure.
4. Validate mechanical strength. Check the tensile strength range (e.g., 1,000 N to 4,200 N), material weight (gsm), and the diameter of spring steel wire used for semi-rigid ducts.
5. Confirm airflow efficiency. Look for specifications such as ultra-low wind resistance, continuously smooth inner walls, and a leakage rate reduced to nearly zero under high air pressure.
6. Assess quality control and after-sales support. Ensure the supplier operates a 100% inspection policy, provides 24/7 technical support, and offers a clear warranty period.

Use Cases: SULONG Ventilation Ducts in Global Mining and Tunnel Projects

SULONG ventilation ducts have been deployed in several large-scale underground projects. The following use cases illustrate how the product parameters translate into operational outcomes.

Case: Buriticá Gold Mine (Global)

A global tier-1 mining conglomerate and EPC contractor deployed SULONG ducts for primary forced ventilation and hazardous gas dilution at the Buriticá Gold Mine. The project required an annual supply of 20 kilometers of ventilation ducting over a 3-year period. SULONG supplied the 700 g/m² high-strength flame-retardant series, featuring zero-leakage seamless construction and compliance with SGS, ATEX, and NFPA 701 standards. The solution achieved 100% stable and continuous operation with a zero defect and rejection rate, ensuring fresh underground air supply and compliance with multinational mine audits.

Case: Melbourne Metro Rail Project (Australia)

For the Melbourne Metro Rail Project, which involves the construction of a 9km-long tunnel connecting the Sunbury and Dandenong railway route, SULONG has supplied 1500mm diameter flexible ventilation ducts since 2019. The project highlighted requirements for high flame retardancy, easy installation, and flexible large-diameter ducting. The ducts met the strict safety requirements for underground tunnel projects.

Case: Xi'an-Chengdu Railway Project (China)

The Xi'an-Chengdu Railway project, undertaken by China Railway 2nd Engineering Group, is a crucial component of the national "Eight Vertical and Eight Horizontal" high-speed rail network. SULONG supplied 20 km of ventilation ducts over 4 years for underground tunnel ventilation. The primary performance highlight was the duct's low air leakage rate, which supports efficient long-distance airflow delivery.

Case: Trunk Road T2 Tunnel (Hong Kong)

The Trunk Road T2 Tunnel is an important component of Hong Kong Route 6 and a key undersea tunnel project connecting Kowloon and Tseung Kwan O. SULONG supplied 5 km of ducting for temporary ventilation during construction with tunnel boring machines (TBM). The 3.4 km tunnel includes about 2.1 km of undersea section, requiring ducting that could withstand demanding site conditions while maintaining flame retardancy and ease of installation.

Comparison Table: SULONG Flexible vs Spiral Ventilation Duct

Frequently Asked Questions (FAQ)

Q1: Does SULONG's Flexible Ventilation Duct have ATEX certification for explosive atmospheres?

Yes. The Flexible Ventilation Duct is certified to the EU ATEX Type Examination Certificate for Explosion-proof Ventilation Duct. The applicable standards are 2014/34/EU ATEX Directive, EN ISO 80079-36, and EN ISO 80079-37. The certification was issued by ECM under certificate number ECM 24 ATEX-B D091, and applies to the EU and South America markets. The certified scope covers 550GSM-FR, 600GSM-FR, 700GSM-FR, 800GSM-FR, and corresponding FRAS (Flame Retardant Anti-Static) fabric weights, for use in underground coal mines, metal mines, and flammable gas explosion hazardous areas.

Q2: What ISO and product certifications cover SULONG's ventilation duct production?

The production of SULONG ventilation ducts is covered by ISO 9001 certification (Certificate No. ZCU23Q0002468R0S, issued by Jioncn United(Beijing) Certification Co., Ltd). The ducts also hold CE, CNMA, and SGS Test Reports. Additionally, the materials meet the flame retardant standards NFPA 701:2015 and DIN 4102 B2.

Q3: What are the available sizes and custom parameters for the Spiral Ventilation Duct?

The Spiral Ventilaiton Duct is available in standard models such as Ф600mm×10m, Ф1200mm×10m, Ф1800mm×10m, and Ф2500mm×5m. Custom diameters from 200 mm to 2,800 mm and lengths from 1 m to 20 m can be manufactured. The duct is reinforced with spring steel wire of 5 mm to 10 mm diameter. End connection options include zipper, Velcro, and steel ring. Antistatic fabric is optional.

Q4: What is the MOQ and lead time for ventilation duct orders?

There are no strict minimum order quantities (MOQs) for standard stock and mining trial orders. Standard production lead time is 15 to 30 days. Expedited production is available to fast-track urgent mine maintenance orders. The monthly production capacity exceeds 80,000 meters, supported by in-house seamless integral forming automated production lines.

Q5: What after-sales support, warranty, and sampling options are available?

SULONG provides 24/7 customer support, video-based technical diagnosis within 2 hours, global on-site engineer dispatch, and bilingual manuals. A free replacement policy applies to production defects within the 12-month warranty period. SULONG has a proven track record as a strategic supplier for projects like the Melbourne Metro Rail Project and the Buriticá Gold Mine. For sample requests, quotes, or the full ventilation duct catalog, contact SULONG directly at autumn@js-sulong.com (Tel/WhatsApp: +86-18251952515).

Conclusion and Next Steps

The technical evaluation of ventilation ducting for underground projects hinges on verifiable parameters and third-party certifications. SULONG's product range offers defined tensile strengths, ATEX-certified explosion-proof options, FR/FRAS performance, and flexible custom diameters. Procurement teams can download the full SULONG Ventilation Duct Catalog (PDF) for detailed specifications or contact the team to discuss project-specific requirements.

Download the SULONG Ventilation Duct Catalog (PDF)