There can be other influences such as exhaust fans or range hoods which may impact of the ability for these types of appliances to operate correctly. Outside patio heaters and portable BBQ’s are not meant to be used inside and there can be dire consequences from their improper operation. It’s also important that the appliances you use inside the house are used for the purpose for which they are designed for. Cookers and cooktops draw their air for combustion from inside the room however due to the limited volume of gas used and short operational time these appliances don’t generally have the same risks as the other appliances. There are sometimes warning signs that the appliance is not working correctly such as a build-up of soot on components of the appliance which in some cases may be visible to the homeowner but more often this can only be detected when the appliance is serviced.Ĭommon open flued appliances include, wall furnaces, space heaters, certain types of indoor installed ducted heaters and water heaters. It is important where this additional ventilation is installed, it is not to be blocked off or removed as this may cause the appliance to operate inefficiently and possibly produce dangerous CO. If this is inadequate, extra ventilation is required to be fitted, usually involving the installation of vents in the wall or ceiling. When installing these appliances, the gasfitter is required to calculate whether there is enough freely available air in the room for safe and efficient operation of the appliance. Some appliances draw their air from inside the room in which they are installed, these are commonly called “open flued or natural draft” appliances. If this happens, the appliance may be damaged or generate dangerous exhaust gases which include Carbon Monoxide (CO), which under certain conditions can enter the room with potentially deadly consequences. When these are out of balance, (eg not enough air flow) the appliance may suffer from a condition known as incomplete combustion. When air and fuel are provided to the appliance in the right balance, it operates safely and efficiently. All gas appliances require oxygen, in the form of air, for the purpose of combustion and the end product of heat.
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