Fan assist systems are an alternative option to a standard conventional boiler flue, which may offer a solution to any potential termination issues encountered with a conventional flue.
The idea of fan assist Flue Dilution is to dilute the flue gases to less than 1% CO2 and 5ppm Nox in order for the flue gases to be safe for a low level or horizontal discharge. This is done by drawing fresh air in from the plant room ventilation pulled in by a fan which is integrated within the flue ductwork. This fresh air dilutes the appliance waste gases before terminating through a discharge louvre. Approx. 10 parts air to 1 part flue gas.
Fan assist can be a great option to negate the need of rising throughout the full height of a building, or to assist in restricted space within the building route to atmosphere, this allows the system to decrease in diameter to facilitate building restrictions.
You can apply fan assist to most modern boilers. However if needed on oil fired applications, sulphur content would need to be advised for us to calculate to see if possible.
Air is usually drawn in directly from the plant room, which would require increasing the high and low level louvres sizes to allow more air into the plant room for boiler combustion process.
We have done many projects for this application.
Suitable systems for this application are:
Factory-made rigid single wall relining flue and chimney system made in stainless steel AISI 304
Factory-made rigid single wall relining flue and chimney system made in stainless steel AISI 316
Factory-made twin wall insulated chimney system made in stainless steel AISI 316 in the inner liner and AISI 304 outer liner
High and medium frequency noises of modern condensing boilers and ventilators and the low frequency humming of the CHP plants are often perceived as disturbing. We offer various flue-gas silencers which reduce the noise pollution effectively.
With flue gas dampers you can regulate the multi boiler applications where not all will be firing at any one time, which assists in avoiding a loss of energy while the boiler doesn’t operate or to successfully prevent any recirculation of exhaust gases from the other appliances in the multiple header systems.