Monodraught Ltd - Roof Top Boiler Houses

Roof top Boiler Houses

Roof top boiler houses have considerable operational advantages for the Building Services Engineer, but create problems on the final appearance of a building as a result of the uncompromising appearance of stainless steel flues and the necessity to provide high and low level ventilation.

The Monodraught vertical balanced -flue, therefore, overcomes all these problems in providing one composite self-contained unit.

The Monodraught system can be positioned on the 'opposite' side of the ridge, where necessary and horizontal ducting provided within the roof space to
the boiler compartment, to convey fresh air for combustion and ventilation, provided the horizontal distance does not exceed the effective vertical height, and the installation complies with British Gas IM/11.

South Leeds Athletics
& Bowls Centre

Eliminates requirement for low level air supply.

No ugly louvres or ducting.

Single operation installation.

Maintenance free and full weatherproof

Supplied in any BS or RAL colour.

Basement Boiler Houses

Basement Boiler Houses have always posed a problem of providing combustion air to low level, the normal method being to use mechanically driven air input. The Monodraught vertical balanced-flue arrangement is therefore ideal in providing all combustion air requirements without the need to rely on any mechanical means.

The British Standard BS6644: 1991 makes a clear reference to Basement Boiler Houses and Clause 19.2.5 states:-

For natural draught boilers installed in basement underground or similarly sited boiler houses where:

(a) communication with the outside air is possible only by means of high level openings and
(b) it is not intended or possible to use a proprietary vertical balanced -flue system, the inlet air shall be ducted to low level

The strong recommendation of the British Standard therefore is that the proprietary system should be used wherever possible.

Having established the principle of entraining air from above roof level, the successful application of the Monodraught system is unaffected by vertical height. Once the cold intake air at roof level has entered the Monodraught system it will descend to basement
floor level, the throughput of air being
dependant on the firing action
of the boilers. Warm air

will rise up through the duct providing the necessary ventilation to the boiler compartment, discharging at high level to atmosphere.