General FAQs

What is the process for getting a product listed to the applicable safety standard?

*Note that the term “certified” is often used rather than the correct term, which is “listed”.

In order to have a product listed to UL, ULC, AnCI, CSA, or other safety Standards, a company must have its product tested by an OSHA accredited laboratory. Once a laboratory receives OSHA accreditation, it then must be approved by the standard writing body in order to then test and “list” products.

Laboratory approvals are issued on a standard by standard basis. For UL-1738 and ULC-S636, only two laboratories are accredited to test and list products in North America, i.e. Underwriters Laboratory  and InterTek.

Each laboratory uses their own mark to indicate that a product has been tested and is listed.

Is InnoFlue® approved for use in the United States?

InnoFlue® is approved for use in the United States. As of today, InnoFlue® is the only polymeric (plastic) vent system listed to UL-1738, the relevant standard for venting Category II, III, and IV appliances.

All codes require that vent systems be tested and approved by the appliance manufacturer on an appliance by appliance basis. Contact Centrotherm Eco Systems, visit our appliance manufacturer approval page, review the venting section of the appliance installation manual, or contact your appliance manufacturer directly to determine if InnoFlue® is approved for use with a specific appliance.

Is InnoFlue® approved for use in Canada?

Canadian code requires all combustion gas vent systems to be listed to ULC-S636. The entire InnoFlue® product offering has been tested and is listed to ULC-S636 Class C, making it approved for use as a combustion gas vent system for sustained flue temperatures up to 230°F (110°C). Check with individual appliance manufacturers’ installation instructions to ensure that InnoFlue® is approved for use with a specific appliance.

How long has InnoFlue® been in service?

InnoFlue3InnoFlue® has been in service for over 17 years. Listed to CE EN 14471 Safety Standard, Centrotherm has manufactured and distributed polypropylene vents to the European market since 1994.

Why use InnoFlue® polypropylene technology over PVC?

Unlike other materials, InnoFlue® is specifically designed for this application. This means that vent specific components like condensate drains, test ports, and non-return valves are available. In addition, Centrotherm provides technical support, provides system sizing, and develops custom parts and OEM components. InnoFlue‘s® polypropylene technology provides several technical advantages over existing polymeric vent materials including increased temperature ratings, enhanced corrosion resistance, innovative design, and a 10-year limited warranty.

For more information on the advantages of InnoFlue®, please go to our Why InnoFlue® page.

Where can InnoFlue® products be purchased?

InnoFlue® is available for sale at major plumbing and HVAC wholesalers.

For list of wholesalers near you, contact Centrotherm or your local Centrotherm Manufacturer’s Representative.

What heating appliances are approved for use with InnoFlue®?

InnoFlue® is approved for use by most major hydronic heating equipment manufacturers (boilers, tankless and tanked water heaters), and furnace manufacturers. For a list of approved heating appliances, visit our Product Approval page or request the latest approval list from your local Centrotherm Manufacturer’s Representative.

Can flue gases from other fuels be vented with InnoFlue®?

Unlike other polymeric or metal vent systems, InnoFlue® is resistant to aromatic hydrocarbons, sulfuric acid, and hydrochloric acid, making it suitable for use for oil, propane, and natural gas fired heating appliances. InnoFlue® is limited only by flue gas temperature, making it ideal for use with condensing heating appliances. InnoFlue® is ULC-S636 listed for sustained flue gas temperatures up to 230°F (110°C).

Does InnoFlue® come with a warranty?

Yes. InnoFlue® provides an industry leading 10-year limited warranty if installed according to Centrotherm’s installation instructions. The InnoFlue® limited warranty covers the replacement of defective product installed in residential applications. Please read our full warranty for detailed benefits and limitations.