How to Choose the Right Size Stove Flue Pipe

When installing a wood burning stove, one of the most important steps is choosing the correct flue pipe size. The size directly impacts performance, efficiency, and safety. At Rhino Flues, we stock a wide range of flue diameters and lengths, ensuring you get the perfect fit for your installation. Here’s what you need to know when choosing the right size flue pipe.

Matt Black Stove Flue Pipe

Match the Stove Outlet

The general rule is that the flue pipe should match the diameter of the stove’s outlet. Most wood burners require a minimum of 5 inches for DEFRA-approved stoves or 6 inches for standard models. Reducing the size of the flue below the stove outlet can restrict airflow and cause smoke to back up.

Wood Burning Stove

Consider Building Regulations

In the UK, regulations require a minimum 6-inch flue for most stoves, with 5 inches only allowed for DEFRA-approved appliances. Using the wrong size could mean your installation fails inspection. Rhino Flues pipes are manufactured to meet all current standards, so you can be confident your system complies.

Importance of Draft

The flue size affects draft, which is the pull of air that helps your stove burn efficiently. A flue that’s too narrow won’t allow gases to escape properly, while one that’s too wide may cause poor draft and wasted heat. Choosing the correct size ensures a steady burn and cleaner fuel use.

Single Wall vs Twin Wall

The size rules apply whether you’re using single wall pipes inside the room or twin wall flues for external runs. Our experts at Rhino Flues can help you select the right combination of parts for your installation.

Conclusion

Selecting the correct flue pipe size is critical to safe and efficient stove operation. Always match your stove outlet, follow UK regulations, and consult a professional if unsure. Rhino Flues supplies a full range of pipes and liners, giving you everything you need for a compliant and reliable installation.