InnoFlue Polypropylene Vent Systems


InnoFlue® Concentric integrates our industry leading InnoFlue® Single Wall, flame retardant, polypropylene special gas vent technology and white powder coated metal outers.


InnoFlue Concentric

InnoFlue® Concentric integrates our industry leading InnoFlue® Single Wall, flame retardant, polypropylene special gas vent technology and white powder coated metal outers. This integrated system allows both flue gases and fresh air to flow through a single component, reducing installation time and roof or wall penetrations.

InnoFlue® Concentric is UL-1738 and ULC-S636 listed. InnoFlue® Concentric is a special gas vent system always listed at zero clearance to combustibles.

Concentric special gas vent lengths and fittings are joined using high performance EPDM H1 gaskets which are suitable for service pressures up to 20 inches of water column (5000Pa) and are resistant to corrosive condensate.


  • Suitable for U.S. Category II and IV or Canadian Type Gas Vent BH, Class II heating equipment:
  • Gas Fired – 230°F (110°C) Max Flue Gas Temp
  • Oil Fired – 248°F (120°C) Max Flue Gas Temp
  • Appliance Type: Condensing Boilers, Furnaces, Tankless Water Heaters & Tanked Water Heaters


  • 2+mm thick rigid polypropylene with powder coated metal outer
  • Full welded metal outers
  • Cast aluminum elbows
  • EPDM Gaskets with an H1 pressure rating (5000Pa).

Features & Benefits

Powder Coated Metal Construction

  • Impact resistant
  • Aesthetically appealing

Fully Welded Vent Lengths

  • Quality construction
  • Eliminates leakage found in crimped systems

Integrated Exhaust & Air Intake

  • Single vent system to install, reducing labor
  • Single roof or wall penetration


Components should be stored in a clean, dry environment in their original packaging.

Health and Safety

For more information on the health and safety benefits of using InnoFlue®, please view our Health and Safety page. Where installation of a InnoFlue® involves working at a height, a full risk assessment must be conducted and appropriate safety measures put into place.


Installation of InnoFlue® does not require any special tools. Centrotherm reccomends that the material temperature is not less than 32°F (0°C) during installation.


Pipes are joined by push-fit connections, with EPDM or Viton gaskets located in the sockets. Pipes and components must be installed with their socket ends to the outlet and male ends to the appliance.


Lubricate seals and male parts of pipes with CENTROCERIN lubricant or water only. Push male end of pipe into opening with light twisting movement.


Components should be selected to minimise cutting. Where cutting is necessary, pipe sections can be cut to length at male end (non-socketed end.) When field cutting, always leave the inner pipe 10mm longer than the outer pipe. Any cuts must be made at right angles to the pipe. Pipe can be beveled for insertion into the adjoining socket to ease installation. All field cuts must be deburred. Elbows and other fittings must not be cut.

For complete InnoFlue® Installation Instructions visit the Literature Section and download the Installation Manual.

Appliance Start-Up

Once InnoFlue® installation is complete, the heating system and flue should be commissioned following the boiler manufacturer’s instructions. There is no cure time or wait time required.