Free Delivery


Free shipping on orders over £125 Net.

*(excludes Scottish Highlands, Northern Ireland, Eire, and Uk Islands)



All Our Products Are Competitively Priced
Without the Compromise On Quality.

Safe & Secure


Sagepay & Paypal is a safer, faster, more secure way to pay online.

How Long Will a Flexible Flue Liner Last? 

Choosing a flexible flue liner requires careful consideration of material and maintenance. It’s durability, whether made from 316-grade or 904-grade stainless steel, depends on proper care.

Regular maintenance ensures longevity. In essence, the choice of material and the commitment to upkeep are pivotal in determining the lifespan of a flexible flue liner.

Key Points


  • A flexible flue liner's lifespan ranges from 15 to 30 years, influenced by the steel's quality and the type of fuel.
  • Regular checks and the use of dry wood can prolong a flue liner's life.
  • The presence of cracks, a weak draft, and rust necessitate the replacement of the flue liner for safety reasons.
  • Selecting the appropriate steel grade, 316 for burning wood and 904 for burning coal, is essential for maximizing the lifespan of the flue liner.

Lifespan Factors

The lifespan of a flexible flue liner significantly depends on the steel quality. However, the fuel type, maintenance frequency, and exposure to corrosive elements are also crucial factors. Different fuels, such as seasoned wood compared to coal, impact the liner's life differently, possibly reducing its lifespan if the fuel choice isn't carefully considered.

Regular maintenance is essential, not just advisable. By inspecting and sweeping the flue liner based on the fuel type, its functionality can be greatly prolonged. Corrosive substances pose a threat, potentially wearing down even the best quality liners over time.

Opting for a less expensive option might appear cost-effective at first but can lead to increased maintenance expenses and potential safety risks later. Investing in superior materials and adhering to a strict cleaning regimen is beneficial, ensuring the flexible flue liner's longevity. The key is to find a balance between quality, maintenance, and the specific requirements of the fuel utilized.

Types of Stainless Steel Liners

Grasping the various stainless steel liner types significantly influences the performance and longevity of your flue. If you intend to use seasoned wood, consider a 316-grade stainless steel liner. This choice, designed for wood-burning, promises a lifespan of at least 15 years, balancing durability with cost-effectiveness.

For those burning coal or similar solid fuels, a 904-grade stainless steel liner becomes pertinent. These liners, crafted for the rigorous demands of coal combustion, assure a minimum 30-year durability. Their superior resistance to coal's corrosive byproducts positions them as the optimal selection for solid fuel applications.

Alternatively, a 904/316 combined liner offers a tailored solution for coal fires. This hybrid liner, blending 904-grade's toughness against acidity with 316-grade's flexibility, presents a durable and efficient choice for enduring the challenges of coal combustion.

Selecting the appropriate stainless steel liner type is crucial for enhancing your flue system's lifespan and functionality.

Maintenance and Care

Ensuring your flexible flue liner's longevity requires consistent maintenance. Perform annual checks and cleanings to maintain its condition, crucial for safely venting your fireplace or stove's smoke and gases.

Utilize appropriate cleaning methods and tools, adhering to the manufacturer's recommendations. This approach prevents damage to the flue liner and secures your home's safety.

Selecting a robust steel type for your flue liner, such as 316-grade for seasoned wood or 904-grade for coal or solid fuels, impacts its durability. Proper care significantly affects these materials' lifespan.

Choosing suitable fuel is important; prefer seasoned wood over wet logs. Wet logs increase creosote buildup, posing a fire risk and potentially reducing the flue liner's lifespan.

Replacement Indicators

Ensuring your home's safety and heating efficiency requires timely replacement of your chimney flue liner. Visible cracks, corrosion, or damage signify the need for replacement, as these defects compromise safety.

Additionally, poor draft, airflow issues, or smoke leakage into the room indicate poor performance, necessitating a replacement. The age of the flue liner, especially if over 15-20 years, suggests the potential need for replacement due to degradation risks, even if it appears in good condition.

Changing fuel types or appliances may require a new liner type, making it an opportune moment for replacement. Professional inspection by a certified chimney technician is advisable for tailored advice on maintaining safety and comfort.

Extending Liner Longevity

Ensuring the longevity of your flexible flue liner involves several key practices. Firstly, performing regular chimney sweeps and maintenance is crucial. These actions remove creosote and soot, preventing fires and extending the liner's life. The frequency of cleanings should align with the type of fuel used.

Secondly, selecting the appropriate materials initially significantly impacts durability. For burning seasoned wood, choosing a 316-grade stainless steel liner, which lasts at least 15 years, is advisable. In contrast, for coal or solid fuel fires, a 904-grade stainless steel liner is preferable, offering a minimum lifespan of 30 years. This choice exemplifies the principle of receiving quality proportional to investment.

Thirdly, using seasoned wood instead of wet logs minimizes corrosion risk, further prolonging the liner's durability. Additionally, ensuring a professional and reputable installation is essential; it represents a long-term investment in your flue liner's integrity.

Lastly, employing the correct cleaning tools and adhering to recommended cleaning schedules are vital measures to avoid damage and maintain the liner's longevity.

Rounding Up

First off, choosing a liner made of high-quality 316 or 904-grade stainless steel is essential.

Next, regular maintenance and sweeping significantly increases it’s lifespan, potentially extending it from 15 to 30 years.

Lastly, keeping an eye out for signs of wear and tear ensures your liner remains  effective and safe for many years.

Vat no. 173389871- Company No. 08618240 - Registered Name: Chimney Supplies Ltd t/a NCS - Copyright © 2023-present National Chimney Supplies