Rectangular and Multi-Flue Systems

There is an increasing demand for rectangular systems that not only enjoy all the advantages of the Monodraught principle , but also satisfy the Engineer's requirement to keep certain flues separate.

Condensing Boilers

Many major Contracts designed these days have at least one condensing boiler. It is normally considered preferable to maintain the flue from the condensing boiler within its own separate flue system. Atmospheric boilers and water heater flues can be taken through the Monodraught system as may be required.

Oil-Fired Boilers

It is generally preferable to keep flues to oil-fired boilers separate so as to maintain the target velocity of 7.5 m/s under all firing conditions. In this case separate flues should be used. Splitter plates can also be used in combined flues to maintain optimum flue gas buoyancy.

Heating and Hot Water

Most contracts have heating and hot water generating plant where the heating requirements are a for greater proportion of the total heat load. Consequently during the non-heating season if the heating and hot water plant are connected into the same flue header then this could have an adverse effect on the performance of the water heater flue. For this reason it is preferable to have a separate flue for the water heater.

C.H.P. Engines

Where required, this type of exhaust can also be incorporated within the Monodraught system as part of the general flueing arrangement. The louvered area can be increased to provide the correct air flow requirements.