Air Forcing Duct

Lay flat ventilation duct ( air forcing ventilation duct / positive pressure ventilation duct / straight length )

Lay flat Ventilation ducting material are usually used in positive pressure application for conveying fresh air to underground worksite. Lay flat ducting are widely used for ventilation in UG mining and tunnel operation. They are flexible, light in weight, easy to transport and require less manpower for installation.

We adopt hot air welding technology to make lay flat duct and for welding place, its strength can be retained to maximum extent. The coupling type can be steel ring, zipper or Velcro. The diameter can be from 10 inches to 100 inches. Our standard section length is 15ft, 30ft, 50ft, 100ft. We can also customize to make special specifications as our customers request.

For our flexible ventilation ducting, flame retardant and anti-static ducting are optional. We can customize to make the ducting material for you at first, then make the final ventilation ducting for you.

Features:

1. high tenacity ployester base fabric/ scrim with PVC coated on both sides.
2. long-time and stable anti-static. ( surface resistivity: less than 100 mega ohm. )
3. flame retardant ( can meet NFPA-701, B1, B2 or M2 standard ).
4. superior broken tensile strength and tear strength.
5. extremely low air leakage rate in a hundred meter.
6. extremely low drag coefficient in a hundred meter.
7. endure the temperature variation.
8. more fold-resistant.
9. easier in repairing.
10. pro-environmental, do not have any unpleasant odor.

Ancillary Product

Tee piece, Wye piece, Branch, Elbow, Reducer, Fan Adaptor

With the help of Tee piece, Wye piece, Branch, Elbow, Reducer, Fan Adaptor, all made of our high quality ducting material, we are able to offer a complete and reliable ventilation system.

Brattice Cloth & Curtains

Ventilation ducting material consist of a woven or knitted textile made from polyester yarn coated on both sides with softened PVC, normally in yellow or black.

The polyester textile gives the Ventilation ducting material its mechanical strength. Different textile thicknesses are used in the different duct qualities. The textile is made in accordance with specifications, including for the number of threads per cm and type of yarn for warp and weft.

The coating on the textile makes the ventilation duct air and water tight, protects the yarn against UV radiation and chemical effects of light, plus it makes it possible to weld the individual sheets together into a circular duct. Thicker coatings provide better wear resistance.

We can make both PVC-coated fabric and PVC laminated fabric from yarn weaving, PVC compounding to final coating or laminating. The width of our fabric can be from 1.00m up to 5.10m. The color can be customized. Our fabric has good flexibility, excellent tensile strength and tear strength.

Our ducting material has following features::

1. Excellent tensile, tearing and adhesion strength
2. long-time and stable anti-static.
3. Being UV resistant, water proof, anti-mildew, cold resistant, acid and alkali resistant
4. Being flame retardant ( FR grade can meet NFPA701, B1, B2, M2 standard )
5. Anti-static ( optional ): surface resistivity: less than 1 X 10 8 ohm
6. Surface treatment: glossy or matt surface
7. Use temperature: -30 - +70 celsius
8. more fold-resistant.
9. easier in repairing.
10. Color, weight and width all can be customized.

Coupling System

Connecting of the Flexible Ducting : Flexible ventilation ducting can be connected in different ways.

Steel Coupling

A steel ring is welded in one end of each tube. The tubes are then connected to each other by mounting the tube end without steel ring over the tube with steel ring. Then a steel connecting ring is mounted over the two tubes and tightened.

A connection system with one inner steel ring a lose tube end gives flexibility and different tube length can be connected to each other.

Zip Connection

Zip connection has been used since the beginning of the eighties. Today it is the most common connection. It is both the most strong and easy way of connection. It's is used when having long tubes and for large diameters. Zip connection is often used in TBM projects. The zip is mounted on the tube in both ends and is easily connected to the next tube.

Velcro Coupling

The Velcro connection can be used for larger diameter to make handling and connecting easier. The Velcro connection is mounted on the tube in both ends and is easily connected to the next tube. It is strong and will not be damaged and can be used for many years.

Ducting Repair

Flexible ventilation ducting is often used in high traffic areas where damage due to equipment and blasting is inevitable. Ongoing maintenance and repair of the ventilation ducting is critical to managing leakage and providing a cost effective, efficient ventilation system. We offers Repair Kits with a number of options designed to provide quick and easy repairs to your installation.

Sewing and Use of Glue

Always have clean and dry fabric to work on. If you sew, use double thread and choose distance between each thread depended on damage. For better results, sew "up and down". This method is for quick repairing and should not be permanent because of leakage. For better durability and density use glue after sewing. It's also usual only to use glue. When using glue, always have something on the inside to press against until the glue is dry. At the same time you avoid that the ducting paste together at the inside.

Hot Air Gun

As an extra we can deliver the repair kit with a hot air gun. Repairing with the hot air gun is the most professional way to repair ductings. The results are optimal durability of a repaired damage and no leakage. When using hot air gun, always have something directly under the area you are repairing! It's very hot, be careful when using it and protect yourself!

Zipper Repair Sleeve

What is more, we can supply zipper repair sleeve for instant ducting repair. It is a quick and easy fix for damaged ventilation ducting that pays instant dividends in reducing leakage. Simply align the Zipper Repair Sleeve covering the damaged section of duct and close the zipper. It's that easy to save money and increase air flow at the face. Zipper repair sleeves are offered in diameters from 10 inches to 100 inches.

Spiral Duct

Spiral ducting ( semirigid ducting / concertina / negative pressure ventilation ducting )

The spiral ducting can be used as elbows in positive pressure application and in negative pressure application , where it is necessary to exhaust air, toxic gases, dusts and other industrial pollutants out.

Our spiral ducting are made of the PVC-coated fabric with spring steel wire helix reinforced. They are extremely flexible (can be compressed) and have good suction effect.

The pitch can be 150mm, 200mm, 300mm and the diameter of wire can be from 5mm to 10mm. The diameter of our spiral ducting can be from 10 inches to 70 inches. Our standard section length is 5m. The coupling type can be steel ring, zipper or Velcro. We can also customize to make special specifications as our customers request.

Features:

1. high tenacity ployester base fabric/ scrim with PVC coated on both sides
2. long-time and stable anti-static. ( surface resistivity: less than 100 mega ohm. )
3. flame retardant ( can meet NFPA-701, B1, B2 or M2 standard ).
4. superior broken tensile strength and tear strength.
5. extremely low air leakage rate in a hundred meter.
6. extremely low drag coefficient in a hundred meter.
7. endure the temperature variation.
8. more fold-resistant.
9. easier in repairing.
10. pro-environmental, do not have any unpleasant odor.