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Single Wall
InnoFlue Polypropylene Vent Systems

Single Wall

InnoFlue® Single Wall Polypropylene Special Gas Vent Systems use industry-leading, flame-retardant polypropylene technology to construct single-wall, gasketed, rigid vent pipes, fittings, and accessories, available in both residential and commercial sizes up to 12".

Vent Lengths

Vent Lengths

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Elbows

Elbows

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Appliance Adaptors

Appliance Adaptors

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Increasers / Reducers

Increasers / Reducers

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Test Ports

Test Ports

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Base Supports

Base Supports

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Tees

Tees

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Condensate Management

Condensate Management

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Kits

Kits

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Terminations

Terminations

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Accessories

Accessories

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Intake / Exhaust Stickers

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4 inch vent pipe fittings polypropylene HVAC system

4 Inch Vent Pipe Fittings for High-Efficiency HVAC Systems

Centrotherm’s InnoFlue® Single Wall Polypropylene Vent Systems provide industry-leading performance for residential and commercial heating appliances. Our advanced polypropylene design delivers safer, cleaner, and faster venting compared to traditional materials such as schedule 40 PVC. Engineered specifically for condensing appliances, our system includes a complete lineup of premium 4 inch vent pipe fittings and accessories for reliable, code-compliant installations.

With corrosion-resistant construction and a push-fit gasketed connection system, InnoFlue® vent fittings eliminate the need for glues, primers, or cure time, allowing immediate appliance startup and significantly faster installation.

Complete Range of Vent Fittings & Components

4 Inch Vent Pipe Fittings Include:

  • Elbows: Perfect for changing direction without compromising airflow.
  • Tees: Connect multiple sections of vent pipe efficiently.
  • Couplers: Seamlessly join vent pipe sections for a secure fit.
  • Adapters: Ensure compatibility with other system components.

Why Polypropylene Outperforms Schedule 40 PVC

InnoFlue® vent fittings are built to meet rigorous industry standards. Our polypropylene material is flame retardant and resistant to high temperatures, providing long-lasting performance. With precise manufacturing tolerances, our fittings guarantee easy assembly, leak-free connections, and consistent airflow throughout your system.

Premium System Construction & Performance

  • 2+mm rigid gray PPs polypropylene construction

  • Flame-retardant and high-temperature resistant

  • EPDM gaskets rated H1 (5000Pa)

  • UV-tested for indoor & outdoor applications

  • Compatible with U.S. Category II & IV / Canadian Type BH, Class II appliances

Maximum Flue Gas Temperatures

  • Gas-fired: 230°F (110°C)

  • Oil-fired: 248°F (120°C)

Suitable for condensing boilers, furnaces, and both tankless and tank-style water heaters.

Fast, Tool-Free Installation

InnoFlue® is designed for rapid, clean installation with no specialized equipment. All connections use a secure push-fit system with factory-installed gaskets.

Installation Highlights

  • No glues, primers, or solvents needed
  • Instant appliance commissioning
  • Lightweight components for easier handling
  • Allows post-installation adjustments

For on-site cuts, use a pipe cutter to create a clean, square edge. Deburr cut ends before insertion, and use a pipe clamp for flex pipe when stabilizing flexible runs.

Key Features & Benefits

Specifically Engineered for Flue Gas Venting

  • Full complement of components and accessories 
  • Evaluated to UL1738 and ULC-S636 by ICC

10-Year Limited Warranty

  • InnoFlue® Vent Systems are supported by an Industry Leading 10-year Limited Manufacturer’s Warranty

Polypropylene Construction

  • Superior Corrosion Resistance in Gas and Oil Environments
  • Sustains Flue Gases up to 230°F (110°C) Max.

Integrated Gasket System

  • No Glues, Primers or Solvents Ever.
  • Allows for Post Installation Adjustments
  • Immediate Use of Appliance Upon Installation

Lightweight

  • Ease to Handle
  • Installs Rapidly

Rapid Installation

  • Reduced Labor Costs by up to 75%

  • LEED Compliance

    • No Solvent Based PVC or CPVC Adhesives Per IEQ Credit 4.1
    • 100% Recyclable

Storage

  • 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 an InnoFlue® involves working at a height, a full risk assessment must be conducted and appropriate safety measures put into place.

Workmanship

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

Installation

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

Joining

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

Cutting

  • Components should be selected to minimize cutting. Where cutting is necessary, pipe sections can be cut to length at male end (non-socketed end).  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. Bends and other pre-formed components 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.
Get in touch with us

Do you have a question about our solutions, our product portfolio or are you interested in becoming one of our international business partners? Please contact us, we will be happy to help you.

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