Concentric Vent Kits & Concentric Vent Pipes

Centrotherm’s concentric vent kit line integrates both the combustion flue and fresh-air intake into a single concentric vent pipe. This dual-function design allows exhaust gases and intake air to travel through one assembly, reducing penetrations and simplifying installation. All systems are UL-1738 & ULC-S636 listed and built with a flame-retardant polypropylene inner pipe and a durable powder-coated metal outer.

Product Overview

Centrotherm’s InnoFlue® Concentric Vent Kits combine a polypropylene inner vent with a powder-coated metal outer casing, creating a reliable and easy-to-install concentric vent system. These kits are available in multiple sizes, including 2/4″, 3/5″, and 4/6″, and in a range of configurations suited for both residential and commercial HVAC applications.

Key Features of a Concentric Vent Kit

• Integrated intake and exhaust in one concentric venting system
• Reduces the number of roof or wall penetrations
• Evaluated and listed to UL 1738 / ULC S636
• Polypropylene inner vent + powder-coated metal outer for durability
• Horizontal and vertical kit options
• Compatible with systems requiring concentric vent HVAC connections
• Suitable for single-unit setups, including a 2 concentric vent kit

What Is a Concentric Vent Pipe?

A concentric vent pipe is a specialized venting assembly where the exhaust flue and fresh-air intake share one concentric, multi-layered pipe. InnoFlue® Concentric Pipes are engineered for this purpose, directing both intake air and flue-gas exhaust through a single penetration. This makes them ideal for applications requiring a concentric kit configuration.

Benefits of Using an InnoFlue® Concentric Vent Kit

Using a Centrotherm concentric vent kit offers several advantages:

• Streamlined installation
• Fewer wall/roof penetrations
• Cleaner visual result
• Factory-engineered safety and compliance
• Optimized performance for matched appliances

Typical Applications & Compatibility

InnoFlue® concentric venting systems are designed for appliances that specifically require concentric venting as part of their manufacturer’s installation guidelines. Always follow both the appliance manual and Centrotherm installation documents.

Technical Specifications

Available Sizes

• 2/4″
• 3/5″
• 4/6″

Materials

• Polypropylene inner vent
• Powder-coated metal outer casing

Listings & Compliance

• UL 1738
• ULC S636

Kit Configurations

• Horizontal terminations
• Vertical terminations
• Multiple complete concentric vent kit setups available