Specializing in,
But Not Limited To, Underground Ventilation Ducts

Sulong has been a pioneer with over 30 years of industry experience in developing innovative flexible and rigid ventilation duct products. We efficiently deliver high quality, seamless welded PVC ventilation fabric to ensure safety, air delivery and performance.

Committed to offering better underground operation conditions for workers, nowadays Sulong also produces PVC and EVA waterproofing membranes.

Enhanced by systematic design and state-of-the-art technology, Sulong has partnered with 3000+ clients worldwide and will continue to offer complete ventilation ducting service.

Sulong fabric China

Your Ideal Partner With 4'P's

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




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.




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

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

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.

Test for Your Required Performance

Accomplished by proficient inspectors and precise inspection equipment in Sulong laboratory


Flame Retardancy

By flame chamber


Heat Resistance

By low-temperature chamber


Tensile Strength

By tensile strength tester


Anti-Static Capacity

By insulated resistance tester

Our Projects

Guangzhou Metro Project

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.

PVC Ventilation Duct for TMCLK HongKong

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.

Haolebaoji Jian Raiway 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.

Melbourne Metro Rail Project Sulong Vent Duct

Melbourne Metro Rail Project - 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

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.

India Hydropower Project

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.

Nepal Hydropower Project 01

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.

Coal Mine Project of ventilaiton duct

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.

  • Guangzhou Metro Project
  • PVC Ventilation Duct for TMCLK HongKong
  • Haolebaoji Jian Raiway Projects
  • Melbourne Metro Rail Project Sulong Vent Duct
  • Northconnex tunnel Project
  • India Hydropower Project
  • Nepal Hydropower Project 01
  • Coal Mine Project of ventilaiton duct

Pioneering In
Extra-Long Tunneling Ventilation Ducting System

The Fruit Of Continous Innovation

A professional provider in supplying underground ventilation ducts requires advanced production capability as every engineering project varies from one to another in ventilation requirements.

Thus innovation is the golden rule in Sulong. Thanks to 32 patents in production technology and long-term partnership with top-of-the-line PVC R&D teams in universities and other institutes, Sulong becomes the FIRST Chinese enterprise capable of providing its best practice ventilation ducts (with the length of 300m per duct) and delivering feasible solutions for EXTRA-LONG tunneling projects.

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