PVS – Permanent Ventilation Seal™

PVS Permanent Ventilation Seal is a patented product developed specifically for underground mining ventilation applications in both conventional and trackless mining operations.

Unique to Biziwe (PTY) Ltd. PVS is manufactured locally at our manufacturing facility in Rustenburg, Northwest Province, South Africa and represents the main focus of our business.


PVS is designed to be installed as a permanent fixture in underground areas with a height ranging from 1.0 meter to 3.0 meters and length varying from 1.0 meter to an excess of 15 meters, which will form a vital part of the ventilation control system. Aiding in preventing the loss of airflow to a particular section by forming a contour hugging airtight seal in between pillars, strike gullies, pillar holing, t/ways, x/cuts, box holes, aiding the directional flow of fresh air to work areas.

A secondary function of PVS is restricting access to “mined out” sections by means of the steel reinforcing used to provide structural rigidity acting as a human barrier.

In addition to the above PVS is well known for its versatility in its applications and has successfully been used to construct underground waiting places and training centres.

Steel reinforcing used in PVS

Coated Steel Reinforcing

Finished Product

PVS Ready for Delivery

Installation Training

As part of our commitment to deliver the best service and expertise we provide training in a team which consist of:

  • 1 x Team leader (Comp A)
  • 3 x Ventilation assistants (Comp B if required)
  • Whom will come to your workplace and train

Technical Information

  • Our product was fire tested by the South African Bureau of Standards and boasts a SABS Class 1 product rating as well as achieving a 00.07 rating during SABS toxicity test.
  • PVS was also Fire Lab Approved.
  • 12 meter Pillar holing – supplied with 14m rolls (depending on height).
  • 6 meter Pillar holing – supplied with 8m rolls (depending on height).
  • Conventional areas will be supplied with 30m rolls (depending on height).
  • Measuring of the PVS must include the overlapping and the bend over edges.


  1. Install the PVS against existing stick support (install additional support if required to maintain the max of 2m skin to skin distance in conventional areas. Trackless sections with pillars, install 4 sticks).
  2. Measure the area to be sealed and cut the PVS to size.
  3. Fold the edges of the cut seal and press into place, ensuring that the vent seal is facing the vent flow.
  4. Allow and measure an overlap of 200mm on the hanging wall, side wall and foot wall.
  5. Nail the seal to the stick support with 6” nails and washers to keep it into position.
  6. Drill the required 8mm holes through the wire mesh corners into the hanging wall, side wall and foot wall.
  7. Insert the sleeve anchors and fasten with a 10mm spanner.
  8. Seal the edges of the hanging wall, side wall and foot wall with cement.
  9. The PVS must be installed according to safe work procedure.

Examples of PVS applications