HAMWORTHY HEATING LTD
43
UPTON FLOOR STANDING SERIES
500001340/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:
The combustion air for the boiler is drawn through the rear of the boiler. 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. 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)
D1.3 Air Supply by Mechanical Ventilation
Air supplied to the boiler room by Mechanical means should be as follows:
1) Mechanical ventilation must be interlocked with the boilers to prevent operation in
the event of ventilation fan failure
2) Mechanical extract ventilation with natural inlet ventilation
MUST NOT
be used.
For Mechanical ventilation systems an automatic control should be provided to cut off the gas supply to the boiler,
in the event of failure of air flow in either inlet or extract fans.
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.
