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Before choosing a gas fire, it is important to know which type of chimney or flue you have. Gas fires are designed to work with specific flue types, so a fire that is suitable for one property may not be suitable for another.
What Is a Class 1 Chimney?
A Class 1 chimney is usually a traditional brick-built chimney found in older properties. It can often be identified by a chimney stack and chimney pot on the roof. These chimneys were originally designed for open fires and normally provide more space than other flue types. A Class 1 chimney may be suitable for a wide range of gas fires and some solid fuel appliances. Older chimneys may need sweeping, testing or lining before they can be used.
What Is a Class 2 Flue?
A Class 2 flue is commonly found in newer homes without a traditional brick chimney. These systems often use interlocking metal flue pipes and may be identified by a metal terminal or cowl on the roof. Class 2 flues are generally narrower than Class 1 chimneys and are designed for compatible gas fires with lower flue requirements.
What Is a Pre-Cast Flue?
Pre-cast flues are often found in properties built from the 1960s onwards. They are formed using hollow concrete or clay blocks built into the wall. From outside, they may be identified by a ridge vent or raised terminal on the roof rather than a traditional chimney pot. Pre-cast flues are normally shallower than traditional chimneys, so they are usually limited to slimline or specially designed gas fires.
Which Flues Are Suitable for Our Nu-Flame Gas Fires?
Our Nu-Flame gas inserts are designed to fit inside our Gallery cast iron fireplaces. They are suitable for compatible Class 1 and Class 2 chimneys and flues but cannot be used with a pre-cast flue. You will also need a suitable gas supply. Your installer can confirm which Nu-Flame model is required for your chosen fireplace.
What If You Do Not Have a Chimney?
You can still have a fireplace if your property does not have a chimney or flue. Suitable options may include:
Some electric and bioethanol fireplaces still require space behind the insert, so check the fitting requirements before ordering.
How Can You Identify Your Flue Type?
A chimney pot, metal cowl or ridge terminal may give you an indication of the flue type in your property. However, previous building work may have altered or lined the original chimney. Arrange for the chimney and fireplace opening to be checked before purchasing a gas fire.
Speak to a Qualified Installer
Gas fires must be installed by a Gas Safe registered engineer qualified to work on gas fires. Your installer can confirm the type and condition of your flue, any ventilation requirements and whether your chosen fire is suitable. Please contact us if you need help matching one of our fireplaces or gas fires to your chimney type.
Phone
01773 718718
Email
sales@castfireplaces.co.uk
