Allergy: Combustion Appliances

As a result of the combustion of fuel, certain by-products are inevitably produced, including water, solid particles (particulates), and, depending on the fuel being burned, a range of gases. This occurs with all appliances that burn fuel. If these by-products are released into the air in the building, they may provoke respiratory symptoms, such as sneezing, coughing, or even an asthma attack, in some people with rhinitis or asthma. High levels of nitrogen oxides may also increase the number of respiratory infections in children. The following points will help you to minimize the level of combustion by-products in the home:

• Keep the number of combustion appliances in the home to a minimum
• Have combustion appliances serviced regularly - once a year
• Make sure that chimneys and flues are working properly
• Keep your home well ventilated

Boilers or furnaces
Balanced-flue boilers, or furnaces, are sealed off from the room. They draw the air they need to burn their fuel from outside, which is where they also exhaust all their combustion by-products. This system is the preferred type for a low-allergen home.

Other boilers or furnaces are open-flued. With these systems, the flue is open to the room from which it draws it air. This means that the combustion gases may escape back into the room.

Unflued heaters
Portable liquid-propane gas, paraffin (kerosene), or butane gas heaters have no place in the low-allergen home. They are unflued and so emit combustion by-products straight into the interior air. In addition, they increase humidity due to the amount of water they produce as a result of combustion. Similarly, unflued gas convector heaters should not be fitted in the low-allergen home.




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