Tyler Brooks
Candles and fireplaces are a great way to create a cosy atmosphere, but it is important to be aware of the impact they can have on indoor air quality. Both candles and fireplaces, including gas fireplaces, can release harmful gases and particles into the air. For example, scented candles are known to release smoke and soot, which can negatively affect air filters and reduce indoor air quality. Similarly, fireplaces can introduce chemicals such as carbon monoxide into the air, and wood-burning fireplaces can release fine particles that can be inhaled. To minimise the impact on health and comfort, it is important to ensure good airflow and a functioning HVAC system, as well as taking precautions when burning candles or using a fireplace.
Do candles affect gas fireplaces?
| Characteristics | Values |
|---|---|
| Candles and fireplaces affect indoor air quality | Harmful gases and airborne materials are released by both candles and fireplaces, with fireplaces having a more significant impact. |
| Candles and fireplaces introduce chemicals | Carbon monoxide and other chemicals are introduced into indoor air by both wood-burning and gas fireplaces. |
| Candles and fireplaces impact health | Frequent or extended use of fireplaces increases exposure to harmful gases. Candles can also negatively affect health by releasing smoke and soot into the air. |
| Candles in fireplaces | It is possible to place candles in a fireplace for a cozy atmosphere. If the fireplace has a gas line, only use faux candles. |
| Candle burning guidelines | Keep candles away from flammable materials and drafts. Trim wicks and remove trimmings before lighting. Do not burn for more than four hours. |
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What You'll Learn
Burning candles and gas fireplaces both affect indoor air quality
While burning candles and lighting a gas fireplace can create a cosy atmosphere, they can also affect indoor air quality. Both candles and fireplaces introduce chemicals and airborne materials into the air. For example, scented candles are known to release smoke and soot, which can negatively affect air filters and reduce indoor air quality. Similarly, fireplaces can introduce carbon monoxide and other chemicals into the air.
The impact of candles and fireplaces on indoor air quality can be mitigated by taking certain precautions. For candles, it is important to ensure they are burned in well-ventilated spaces, away from drafts that can cause flames to grow. It is also recommended to trim wicks and avoid burning candles for more than four hours at a time. With fireplaces, it is crucial to ensure proper ventilation by opening the flue before starting a fire and warming the fireplace with a smaller fire first.
The type of fuel used in fireplaces can also affect indoor air quality. Wood-burning fireplaces release fine particles and chemicals into the air, even with a clean fireplace and chimney. The use of dried, unpainted, and unstained wood is recommended to minimise the release of harmful substances. Ventless gas fireplaces, on the other hand, vent heat and byproducts of burning directly into the indoor environment, increasing exposure to harmful gases and materials.
To maintain good indoor air quality, it is essential to ensure proper ventilation and a functioning HVAC system. This includes regularly changing furnace filters and scheduling annual inspections by trained professionals. Taking these steps can help minimise the impact of burning candles and using gas fireplaces on indoor air quality, creating a healthier and more comfortable environment for occupants.
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Scented candles are known to release smoke and soot into the air
Candles are a popular way to create a cosy atmosphere, especially during the colder months. However, it is important to be aware of the impact that candles can have on indoor air quality. Scented candles, in particular, are known to release smoke and soot into the air.
Soot is a mixture of carbon, aerosolized chemicals, and tar-like substances. It is generated when a candle flame is extinguished or flickers due to incomplete combustion. This occurs when a flame doesn't have enough oxygen to allow the fuel to react completely. In addition to soot, scented candles can release volatile organic compounds (VOCs), which are a wide range of chemicals that vaporize into the air. These VOCs can include dangerous chemicals such as benzene, even when the candle is not lit.
The amount of harmful gas and airborne material released by a single candle is typically minimal and unlikely to cause health effects. However, frequent or extended use of candles can increase exposure to these pollutants. Additionally, the impact on indoor air quality is compounded when using a fireplace, as both wood-burning and gas fireplaces introduce chemicals such as carbon monoxide into the indoor air. Burning wood also releases fine particles that can be inhaled.
To minimize the impact of candles on indoor air quality, it is recommended to avoid burning them in small, enclosed spaces and to ensure proper ventilation. Burning candles with wicks made from natural materials like beeswax or soy wax can also help, as these produce less soot than paraffin candles. It is also important to ensure that your HVAC system is functioning properly and that your home has adequate air circulation.
By following these guidelines, you can enjoy the cosy atmosphere and pleasant scents of candles while minimizing their impact on your indoor air quality and health.
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If you have a gas line, only use faux candles
If you have a gas line, it is important to only use faux candles in your fireplace. This is because real candles with an open flame can be dangerous in small, enclosed spaces. A candle's flame produces heat, light, water vapour, carbon dioxide, and, if the flame flickers, unburned carbon particles (soot).
To create a cosy fireplace display, first, remove any gas logs and place a grate over the gas line for protection. Then, cut a piece of cardboard to fit inside the grate and spray it black. Finally, add your faux candles. You can choose from a variety of taper or pillar candles, selecting different heights and colours to create a whimsical and intimate vibe.
Faux candles can be remote-controlled, making it easy to illuminate your space. LED candles are also a great option, as they come in various sizes and colours, allowing you to create a unique and creative arrangement.
Remember to always exercise caution when using candles and fireplaces. Ensure your space is well-ventilated, keep flammable materials away, and never leave a candle or fireplace unattended.
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Burning wood releases fine particles that can be inhaled
Burning candles and wood in fireplaces can affect indoor air quality. While candles and fireplaces are great for creating a cosy atmosphere, they can introduce chemicals and airborne materials into the air. For example, burning wood releases fine particles that can be inhaled. These particles are so microscopically small that they can infiltrate our homes from the outside, even with the windows closed. They can also reach the deepest parts of our lungs and enter our bloodstream.
Wood smoke is a major source of particle pollution, particularly in residential areas. In densely populated neighbourhoods, the "intake fraction" from wood burning is higher because more people are exposed to the smoke in a small area. The microscopic particles released by burning wood can get into our eyes and respiratory system, causing burning eyes, a runny nose, and illnesses such as bronchitis. They can also worsen asthma symptoms and trigger asthma attacks. Additionally, fine particles can have serious cardiovascular effects, including triggering heart attacks, strokes, irregular heart rhythms, and heart failure, especially in individuals who are already at risk.
To minimise the impact of burning wood on indoor air quality and health, it is recommended to limit the use of wood-burning fireplaces. When using a wood-burning fireplace, ensure that the flue is open, and warm it with a small fire to create an updraft before adding more fuel. It is also important to use thoroughly dried, natural wood and avoid burning painted or stained wood. Annual professional servicing of the fireplace, flue, and chimney is crucial. Maintaining a functioning HVAC system is another way to improve indoor air quality.
Additionally, it is important to be cautious when burning candles. Keep them away from flammable materials and avoid burning them in enclosed spaces or containers with narrow openings. Ensure that they are not affected by drafts, and trim the wicks to a quarter of an inch before lighting. It is recommended not to burn candles for more than four hours at a time. Proper fire safety measures, such as keeping functioning fire extinguishers in the home, are also essential.
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Fireplaces with a chimney flue can cause negative pressure
The taller the house, the greater the stack effect, which refers to the pressure differences at various levels in the house. Basements are the most susceptible to problems caused by the stack effect as they are the lowest point in the home and must work against the negative pressure.
Negative pressure can cause fireplaces to smoke and gas appliances to backdraft carbon monoxide gas. It also increases energy and heating costs as it draws cold air in through paths of least resistance.
To address negative pressure, you can install a draft-inducing heater on the flue collar of a stove or insert, or a whole-house ventilator. Direct vented (DV) gas fireplaces, stoves, and inserts do not have a problem with negative pressure as they use a sealed combustion system and 100% outside air for combustion.
To minimize the impact of fireplaces on indoor air quality, ensure the flue is open before use and warm the fireplace and flue with a small fire to create an updraft before adding more fuel. Have your fireplace, flue, and chimney professionally serviced annually, and ensure your HVAC system is functioning correctly.
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Frequently asked questions
Yes, candles can be used in a gas fireplace for a cozy, low-effort solution to light up your room. However, if your fireplace has a gas line, you should stick to using faux candles.
To set up candles in your gas fireplace, first, remove anything in it, such as gas logs. If you have a gas line, leave the grates. Clean up any debris with a vacuum, then place a piece of black-painted cardboard on top of the grate so that the candles can sit. You can then arrange your candles—varying heights and colours can add visual interest and a feeling of coziness and warmth.
Burning candles can negatively affect indoor air quality, as some candles cause soot to form. Scented candles are notorious for the smoke and soot they release into the air. Candles should be kept away from flammable materials and out of drafts that can cause flames to grow.
To maintain good indoor air quality when using a gas fireplace, ensure your HVAC system is functioning properly and the air is circulating appropriately. Actions like changing your furnace filter as recommended by the manufacturer and scheduling an annual inspection by a trained HVAC technician can help.
