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One of the questions we’re regularly asked about the Nu-Flame gas inserts we use in our cast iron fireplaces is whether you need an additional air vent in the room.
For most of the Nu-Flame inserts we currently supply, you don’t. The exception is the NG17 used with the Tradition fireplace, which requires additional room ventilation. Our current Nu-Flame range is set up specifically for the Gallery cast iron fireplaces we sell.
Nu-Flame’s instructions state that, in the UK, models with a net input of 6.9kW or less do not require additional room ventilation. Models above this level have different requirements. The NG17 we supply for the Tradition fireplace is over 6.9kW, which is why additional room ventilation is required. The final ventilation requirements should still be checked by the Gas Safe registered engineer carrying out the installation.
We use six main Nu-Flame inserts across our Gallery cast iron fireplaces.
These are:
Each insert is matched to particular cast iron fireplaces, so you don’t need to choose the gas insert simply by looking at its dimensions. For example, the NG2 is used with fireplaces including the Bolton, Celtic, Crown, Jubilee, Lytton and Pembroke, while the NG17 is specifically used with the Tradition. You can see the full list on our Nu-Flame gas inserts for Gallery fireplaces page.
No. There’s an important difference between additional room ventilation and the airflow the gas fire itself needs to work correctly. Nu-Flame states that the fire front or fret must allow enough primary air into the appliance. Their instructions specify a minimum primary air inlet area of 50cm² and warn against changing the fire front or fret without first checking its suitability. So even where an additional room vent isn’t required, the airflow around the fire itself must not be restricted.
The Nu-Flame inserts we use are designed for suitable Class 1 or Class 2 chimneys and flues, depending on the model. Nu-Flame’s instructions state that models with a net input of 6.9kW or less require a minimum flue diameter of 125mm, or an equivalent area, subject to the flue clearing the products of combustion correctly. Models above 6.9kW require a minimum flue diameter of 175mm or equivalent area. The Nu-Flame inserts we sell for our Gallery fireplaces are not suitable for pre-cast flues.
If you’re unsure which type of chimney or flue you have, our guide to Class 1 and Class 2 chimneys and flues explains the difference.
Choosing the correct Nu-Flame insert is only part of the installation. Nu-Flame states that the flue must be clear of obstructions, continuous and structurally sound. If the chimney has previously been used for solid fuel, it should also be swept before the gas fire is installed. The installer also needs to check that the flue draws correctly and that the products of combustion are clearing properly.
If your room already has a permanent air vent, don’t automatically block it because the new Nu-Flame fire doesn’t require additional room ventilation. There may be another reason why the vent was originally installed. Let the Gas Safe registered engineer check the room, fireplace and existing ventilation before anything is altered.
If you’re buying one of our cast iron fireplaces with a Nu-Flame gas insert, we’ll supply the appropriate model for that particular fireplace. The chimney, flue and ventilation still need to be checked as part of the gas installation, and Nu-Flame states that these appliances should be installed and serviced by a properly qualified engineer. If you’re unsure which Nu-Flame insert is used with a particular cast iron fireplace, tell us the fireplace name and we’ll confirm the correct option for you.
Phone
01773 718718
Email
sales@castfireplaces.co.uk
