86 Products that perform | Service that delivers | People that care Open flue Combustion air supply is drawn directly from the room, and flue gases may be discharged through a flue system using either an existing chimney (subject to suitability) or a ducted flue system. The plant room requires ventilation to provide air for combustion and cooling the plant room, in accordance with BS5440 and BS6644. The flue system will typically rise to the top of the building and discharge above roof level, although some modern low output gas boilers may have an open flue system terminating at low level (in accordance with flue discharge requirements, see page 88 for more details). Room sealed Combustion air supply is drawn via ducts from outside. Flue gases may be discharged through either a concentric or twin duct flue system. The plant room requires ventilation in accordance with BS5440 and BS6644. Plant rooms will require less ventilation than open flue systems, and with reduced airflow, warmer room temperatures are possible - a useful point when designing tighter buildings. Room sealed appliances reduce the risk of flue gases spilling back into the plantroom due to poor flue operating conditions. In certain buildings the boiler can be installed within occupied spaces where a dedicated plant roommay not exist. Concentric flue A concentric flue system provides a very compact room sealed flue, where the air supply and flue gases are managed within a one piece concentric duct system. Typically using a duct within a duct, the flue gases are expelled through the inner duct with combustion air being drawn in via the outer annulus. A concentric flue system will have the option for the terminal to be positioned horizontally for exiting the building through the wall, (subject to IGEM UP10) or vertically through the roof. The need to only penetrate the building (roof or wall) with a single hole is an advantage. Coping with condensate When changing from atmospheric boilers to condensing, the existing flues on this type of system are not able to deal with a modern pressurised and wet system where condensate will form. The flue systemmust be water and pressure tight, and designed to drain the condensate from the flue and prevent flow back into the boiler. Where possible, you may be able to make use of the existing chimney with a liner, thus, enabling it to cope with condensing operation. How to order flue components Full details of flue systems can be seen in the individual product brochures. To simplify the flue ordering process, Hamworthy has a flue order form available for you to call off all your flue component requirements. To request a flue system order form, telephone 01202 662500 or email sales@hamworthy-heating.com and state which flue system you are planning to use. Introduction to flues Our boilers and water heaters are suitable for many flue systems and we can provide flue components to suit these schemes. You can choose from the flue types below or a bespoke flue system can be designed by our flue partner, Jeremias. Types of flue systems Subject to specific risk assessment procedures detailed in IGEM/UP/10 Edition 4, room sealed appliance installations up to 333kW total Nett input may be terminated at low level. Modern condensing boilers generate condensate from the flue gases at a rate of around 13 litres per hour for a 100kW boiler, in condensing conditions. ADDITIONAL PRODUCTS
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