Flexible Ventilation Ducting
Manufacturer in China

Reliable lay flat ventilation duct supplier with superior quality & cost-effective solutions in ventilation ducting by over 30 years of experience.

Specializes in producing underground ventilation ducts for wholesalers / distributors / project contractors / ventilation equipment manufacturers, regarding tunneling / mining / industrial markets.

You Will Benefit From

Underground ventilation duct highly-customized to meet your specific business needs based on your budget & quality requirement.

Competitive Wholesales Price

Most affordable cost secured by self-made fabrics, reliable hardware suppliers and patent extrusion technology.
All-round Superior Quality

Environment-friendly raw materials, self-developed PVC extrusion processing line & all ducts with NPFA 701( MSHA) approved.
All-in-one Precise Customization

Offering PVC fabric Solutions to meet your global market demands by chemical performance/weight / length / width / color / etc.
100% Benefits Guarantee

Up to 12-months warranty and free sample available with SGS & CE approval certification.

Submit Your Enquiry & Get New Catalog

Our expert team will answer your inquiries within 12 hours.

Remark: The latest product catalog is available for download once your form is sent out!

Mine & Tunnel Flexible Ventilation Duct

Offering ducts with MSHA (NPFA 701) approved. No minimum quantity required.

Lay Flat Ventilation Duct

High pressure round ventilation ducting ideal for positive pressure airflow

Oval Ventilation Duct

Available in lay flat and spiral ventilation ducting suitable for both positive and negative pressure airflow

Semi Rigid Ventilation Duct

Spiral ventilation duct with spring steel wire (φ5mm-φ10mm) reinforced featured with high pressure resistance

Industrial Flexible Duct

Flexible duct with PVC laminated fabric and steel wire (φ2mm-φ4mm) reinforcing by rubber strip covered.

Ideal for Underground Ventilation

Safe

Exclusive hot-welded construction (best practice technique in the industry) builds the low-leakage ducting system as the nylon fabric adheres to the PVC film seamlessly, which delivers more air to where it is needed.

Energy Efficient

In-house R&D experts produce durable ducts as the PVC film is made evenly by the perfect reaction of top-quality PVC resin and other chemical components.

Durable

The flexible design in the ventilation system enhanced by exceptional performance makes the duct easy to install, extend and repair during the underground operation.

Your Ideal Partner With 4'P's

For engineering projects, price decides duct performance and vice versa.

Professionalism

Specialists from our R&D team have been working in the underground ventilation industry for more than 30 years. To form a high-performance fabric based on customer-required performance, they make fabric ingredients with exact proportions case by case and test duct with carefulness.

Price

As an integrated manufacturer of PVC fabric and underground ventilation duct, Sulong can offer a production plan fit for your project budget. Our competitive pricing can make the duct textile of you-required quality.

Product Performance

Specializing in ventilation duct and PVC fabric, Sulong can produce the textile whose physical performance is up to industrial standard and customer requirement. Our fabric performance has got wide recognition from clients who head underground ventilation projects.

Project Provider

With advanced technologies in ducting engineering and fabric production, Sulong is confident to offer one-stop service support and on-demand product supply. Long-lasting partnerships with all types of customers have reinforced our experience and strength in the industry.

One-Stop Ventilation Ducting Service

Reliable Design Support

Sulong cooperated with reliable partner Korfman extractor fan(Top 3 in its industry) to achieve your entire ventilation system design in one turnkey solution and save your operation costs and time.

Made-In-House Ducts Supply

A wide array of flame retardant ducts with custom choices standing by adapt to your actual operation ventilation, FREE SGS testing for your ventilation textile is available once you require it.

Worry-Free Aftersales Service

All ducts are guaranteed for 12 months. Free new products supplied if the original goods are damaged during delivery. On-site technical support is available if the ducting system gets ruined during operation.

Professional Engineered Airflow Design

Expertise decides the details of the ducting system while the software calculates the outline.

Data-Based

Ventilation calculator based on SIA recommendation supported by our partner calculates the recommended duct diameter, fan size, and expected air pressure.

All you need to do is to send a few parameters by clicks of the mouse, including

• Tunnel cross-section
• Tunnel length
• on-site(working temperature, altitude, etc)

Expert-Oriented

Duct diameter is not the only thing to consider when faced with the complex topography. An appropriate ducting system would lessen your operation costs based on normal ventilation, which requires various types of flexible duct to be included.

• Experience in serving over 3000+ clients from tunneling to hydraulic field
• A full ducting solution with specific types, shapes, angles, and lengths.

Finished Product Quality Inspection

Grab Tensile Testing Flame Retardant Test
（NFPA 701 Small Scale) Low-Temperature Bend Test Finished Duct Inspection

Based on DIN53354 Standard or ASTM Standard (or other types of national standard), sampling fabric would undergo a grab test to meet customer requirement by in-house tensile strength tester.

Inspectors set up related data and supervise the whole process step by step to get the result precisely.

For underground ventilation ducting, the flame-resistant properties need to be fully understood so that the flexible hose can be used safely in the engineered operation work.

For delivering fabric product that meets NFPA 701 Standard, a Sulong expert performs the test in the flame chamber to measure the flammability of a fabric when it is exposed to specific sources of ignition.

Fabrics coated with PVC are used in underground ventilation requiring low-temperature flexing.

Referred to the GB, ASTM and Din Standards, the test method evaluates the ability of fabric sample in the low-temperature chamber to withstand a selected bend at an established low temperature.

Based on DIN53354 Standard or ASTM Standard (or other types of national standard), sampling fabric would undergo a grab test to meet customer requirement by in-house tensile strength tester.

Inspectors set up related data and supervise the whole process step by step to get the result precisely.

Approved Certificate

ISO9001 Certificate

ISO14001 Certificate

SGS Test Report

CE Certificate

Wide Application of Industries Served

Sulong Duct Tunnel Project 01 副本 e1773025735405

Tunneling Ventilation

Mine Ventilation

Industrial Ventilation

Explore Our Projects

Guangxi Beibu Gulf Project e1773023522661

Guangxi Beibu Gulf Project - China

The project undertaken by China Water Resources and Hydropower 14th Engineering Co., Ltd. in the Beibu Gulf region of Guangxi is a major national water conservancy project with a total length of 30 kilometers. The project uses domestically advanced slurry balance shield tunneling machines (about 4 meters in diameter) to specifically address the challenges of the Beibu Gulf region's abundant water and complex geology.

Sulong Duct Tunnel Project 01 scaled e1773025233141

Xi'an-Chengdu Railway Project - China

The Xi'an-Chengdu Railway project, undertaken by China Railway 2nd Engineering Group, is one of the largest and most technically challenging projects currently under construction for the group. It is also a crucial component of the national "Eight Vertical and Eight Horizontal" high-speed rail network, with a total length of 19.68 kilometers.

Trunk Road T2 Tunnel - HongKong, China

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. Constructed using tunnel boring machines (TBM), it avoided large-scale land reclamation, minimizing its impact on the marine environment. It is approximately 3.4 kilometers long, including about 2.1 kilometers of undersea tunnel.

TMCLK Project - HongKong, China

Tuen Mun-Chek Lap Kok link–Northern Connection Sub-Sea tunnel section, as Hong Kong’s deepest, longest and largest sub-sea road tunnel. We have supplied 2500mm diameter ventilation duct in the past years.

South-To-North Water Diversion Project - China

The Yangtze River Diversion Project to Supplement the Han River is a follow-up water source project of the South-to-North Water Diversion Project (Middle Route) and the first major project to commence construction among the follow-up projects. It is approximately 194.8 kilometers long. Known as the "underground lifeline" connecting the Three Gorges Project and the South-to-North Water Diversion Project, it aims to address the water shortage problem of the

Melbourne Metro Rail Project Sulong Vent Duct

Melbourne Metro Rail Project - Melbourne, Australia

The Melbourne Metro Rail Project involves the construction of a 9km-long tunnel within Melbourne, Australia, connecting the Sunbury and Dandenong railway route. Construction is scheduled to begin in late-2018 and operations are expected to start in 2025. We have have supplied the vent ducts of 1500mm diameter since 2019.

Northconnex Tunnel Project - Sydeny, Australia

This project will be one of the longest road tunnels in Australia. The approx. 9km long double tube tunnel north of Sydney connects the M1 motorway near Wahroonga with the M2 motorway in West Pennant Hills, thus connecting the city’s north to the 110km long bypass known as the Orbital Network. This will bring relief to Pennant Hills Road, which is being used by more than 5,000 trucks per day. We have supplied 1800 dia lay flat duct and 2100 dia semi rigid duct since 2017.

Guangzhou Metro Project - China

We signed a partnership with Guangzhou Municipal Group Co., Ltd in 2016. We cooperated with underground projects on Guangzhou Metro projects and Tianhe Smart City Urban Corridor to successfully provide ventilation system design and ventilation ducts for these projects.

Haolebaoji-Ji'an Raiway Projects - China

It is a new strategic corridor for “North-South Coal Transport” in China, with a total length of 1813.5 kilometers, and is the world ’s longest one-time heavy-duty railway built in one operation. We have supplied the 2200mm diameter semi-rigid duct and lay flat duct since 2016.

Mai-Beni Hydropower Project - Ilam, Nepal

Located in the middle reach of Mai river in IIam district in eastern part of Nepal, Mai Beni Hydropower Projects is a runoff river type hydropower of 9.51MW. We have supplied 550mm diameter ventilation duct since 2019.

Solu Khola (Dudhkoshi) Hydropower - Solukhumbu, Nepal

This project is an 86 KW Run of River type of project located at Solukhumbu District, Sagarmatha Zone, Nepal. We have supplied the 1100mm dia oval ventilation duct and 800mm dia lay flat duct for this project since 2019.

Vatukoula Gold Mine Projects - Fiji Island

We have supplied our ventilation ducts and ventilation fans to Vatukoula Gold Mines since 2016, It is the owner of the largest producing gold mine in Fiji. Already operating for over 75 years, their mine has produced in excess of seven million ounces of gold.