HAMWORTHY HEATING LTD
44
Wessex ModuMax
mk3
Boilers
500001308/C
APPENDIX D
-
VENTILATION
D1.1 Air Supply
Detailed recommendations for air supply are given in BS 6644 and BS5440 Pt 2. The following notes are intended
to give general guidance. In all cases there must be provision for an adequate supply of air for both combustion
and general ventilation, in addition to that required for any other appliance.
Note:
For Open flue applications, combustion air for the boiler is drawn through the top of the boiler casing. The
air inlets
must
be kept open and free from blockage at all times.
LPG
-
installations. It is strongly recommended that gas detection equipment is fitted. This equipment
should be positioned near the boiler(s) and at low level. The space housing the boiler(s) must be
ventilated at high and low level in accordance with the following;
D1.2.1 Air Supply by Natural Ventilation
-
Open Flue applications
The boiler room must have, or be provided with, permanent air vents directly to the outside air, at high level and at
low level. For an exposed boiler house, air vents should be fitted, preferably on all four sides, but at the least on
two sides. Air vents should have negligible resistance and must not be sited in any position where they are likely
to be easily blocked or flooded or in any position adjacent to an extraction system which is carrying flammable
vapour. Grilles or louvres must be so designed that high velocity air streams do not occur within the space
housing the boiler.
Boiler house ventilation
Low level (inlet)
-
4cm² per kW of total rated input (Net)
High level (output)
-
2cm² per kW of total rated input (Net)
Compartment ventilation
Where the boiler is to be installed in a cupboard or compartment, permanent high and low level ventilation is
required which must communicate direct to outside, for cooling purposes.
Low level (inlet)
-
10cm² per kW of total rated input (Net)
High level (output)
-
5cm² per kW of total rated input (Net)
D1.2.2 Air Supply by Natural Ventilation
-
Room Sealed Installations
Where the boiler(s) are to be installed in a boiler room or internal space, the room or internal space must have
permanent air vents directly to the outside air, at high level and at low level with the general requirements detailed
above on location and construction.
Boiler house ventilation
Low level (inlet)
-
2cm² per kW of total rated input (Net)
High level (output)
-
2cm² per kW of total rated input (Net)
Compartment ventilation
Where the boiler is to be installed in a cupboard or compartment, permanent high and low level ventilation is
required which may communicate to an adjoining room or outside, for cooling purposes.
Ventilation to a room or internal space
-
10cm² per kW of total rated input (Net)
Ventilation direct to outside
-
5cm² per kW of total rated input (Net)
