Single Flow Vents

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The RVS Range of Pressure Relief Vents is a new development in the world of pressure relief vent for gaseous extinguishing system that provides a greater efficiency factor of free vent area at all pressures than its competitors. The pressure vent blades start to open at above 80 Pascal’s and is fully open at 100 Pascal’s pressure and can be calibrated using a Room Integrity Test Kit. The special design provides 92% free vent area from 100 Pascal’s room pressure. This means that you need less vents, smaller holes, less builders work, smaller vents and we now provide a greater size range.
The range comes with a 4 hour fire rating to BS476 & certified to EW120 & E120 to EN1364-1 &2, Third Party Verification of its operation IN LIVE GAS DISCHARGE TESTS by an independent consult. Reports available on request.
The RVS range is supplied in two kits. One for internal use and one for external use. The RVS vent only is used for internal and the RVS vent with the DL Dynamic Louvre is used for external venting.
  • 4 hour Fire Rate
    There is only one other manufacture with its’ full range fire rated for 4 hours.
  • 90% free vent area
    We have carried out a number of live gas discharges and venting simulations which have been witnessed by an independent consultant to verify our free vent areas.
  • 100mm flanges on RVS700 & 1000
    We have increased the flange size over our competitors with 60mm on the RVS150, 300 &500 vents and 100mm on the RVS700 & 1000 to improve the installation and stability of our vents.
  • Solid welded construction.
    The RVS, RVB and RVD vents have a solid welded construction which eliminates flexing and blades sticking if installed incorrectly even if our vent is dropped it will work
  • Aesthetically Pleasing design
    Our vents are designed to blend in to the fabric of a risk. We don’t have rivets or fixings visible and the unit is powder coated in a white finish (or clients choice of colour) to blend in.
  • Manufactured in Britain
    All our design and manufacturing is carried out in the UK. Nothing is sourced from China or any other country.

RVS Pressure Vents. Multiple sizes available. Choose from:

  • 150 x 300 mm Single Flow Vent Kit
  • 300 x 300 mm Single Flow Vent Kit
  • 500 x 500 mm Single Flow Vent Kit
  • 700 x 700 mm Single Flow Vent Kit
  • 1000 x 1000 mm Single Flow Vent Kit

Vent Size



Height (mm)



Width (mm)



FVA @ M2100Pa



Hole Opening (W x H)

710 mm x 730 mm

1010 mm x 1020 mm

Unit Weight



Wall Opening Size (W x H)

745 mm x 745 mm
or 29.33” x 29.33”

1050 mm x1045 mm
or 41.34” x 41.14”

Fire Rating

4 Hours to BS476-20 and certified to E120 / EW120 to EN13501


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