The simple principle
A new fire normally needs more air. Once the firebox and flue are hot and the fuel is burning cleanly, the controls can usually be reduced gradually to the appliance’s normal operating position. The aim is a stable, lively flame — not a roaring fire and not a smoky smoulder. Make one small adjustment at a time and watch the response.
Primary, secondary and airwash air
- Primary air usually enters low in the firebox and is often most useful during lighting or with certain approved solid fuels on a multi-fuel appliance.
- Secondary air usually enters higher in the firebox and helps burn gases released from the wood, supporting cleaner combustion.
- Airwash is commonly part of the secondary-air system and directs air down or across the glass to help keep it clearer.
Not every stove uses these labels or separates the controls in the same way. Always identify what your own controls actually do before applying generic advice.
A practical routine from lighting to steady burn
- Open the required controls for lighting as specified in the manual.
- Build a small hot fire with dry kindling and suitable fuel.
- Let the flames establish and warm the stove and flue.
- Reduce the controls gradually — not all at once.
- Watch the flame: if it becomes lazy, dark or disappears while fresh wood is still giving off gases, you may have reduced the air too far.
- When refuelling, use the manufacturer’s recommended routine and allow the new load to catch cleanly before settling the controls again.
Signs you may be using too little or too much air
Too little air can show up as lazy flames, black glass, smoke and a fire that struggles after refuelling. Too much air can make the fire race, consume fuel quickly and send more heat up the chimney. A
stove thermometer can be useful for observing trends where the manufacturer permits one, but it does not replace the manual or correct installation.
Never use air starvation as a burn-time trick
Do not close the air controls simply to make a load last all night if the result is a smoky, smouldering fire. That can increase soot and deposits and reduce clean combustion. Do not alter factory stops or modify combustion-air arrangements. Follow the stove manufacturer’s instructions and seek competent advice if the appliance cannot be controlled normally.
Learn the response of your own stove
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