Figure D1 Mechanical Ventilation Flow Rates - Hamworthy MILBORNE381 Series Design Installation, Commissioning And Operating Instructions

Wall hung, pre-mix, condensing, modular boilers

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D 1.4. Boiler House Temperatures

The air supplied for boiler house ventilation shall be such that the maximum temperatures within the boiler house

shall be as follows:

At floor level (or 100mm above floor level) = 25°C.

At mid-level (1.5m above floor level) = 32°C.

At ceiling level (or 100mm below ceiling level) = 40°C.

D 1.5. General Requirements

The air supply should be free from contamination such as building dust and insulation fibres from lagging. To

avoid unnecessary cleaning and servicing of the boiler modules, the boilers should not be fired whilst building

work is being undertaken.

High and low level ventilation grilles shall be positioned as high and as low as practicably possible. Low level

grilles should be located within 1 metre of the floor for Natural Gas and within 250mm of the floor for LPG. High

level grilles should be positioned within 15% of the boiler room height from the ceiling. High and low level grilles

shall communicate with the same room or space where compartment ventilation is used. Where grilles

communicate directly with outside air, they shall be positioned on the same wall.

Note * : Where the associated air extraction is also by means of a fan, this shall be selected such as not to

cause a negative pressure to develop in the boiler house and to maintain the difference between inlet and

extract flow rates shown above.

The calculated extract flow rate is the actual inlet flow rate minus the appropriate figure in the table above.

HAMWORTHY HEATING LTD