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9.2 COOLING VENTILATION
When used as a type C appliance, installed in a compartment or an enclosure, cooling ventilation should be provided as follows:
Input
Model
(Gross)
kW
CP-M+60
62.2
CP-M+80
82.2
CP-M+100
102.2
CP-M+120
123.3
CP-M+150
153.3
CP-M+180
184.3
When used as a type B appliance, provision for cooling ventilation is included in the combustion ventilation allowance.
9.3 MECHANICAL VENTILATION
In situations where combustion air cannot be provided by the means of ventilation grilles, it can be supplied by a fan. The
minimum flow rate for the fan should be in accordance with Table 9.4.
If required, extract air can also be through the use of a fan. When sizing the extract fan, the extract flow rate should be calculated
by subtracting the difference volume (from Table 9.4) from the actual supplied volume of inlet air. If therefore, a larger than
required inlet volume is provided, the extract flow rate will need to be increased accordingly.
If the ventilation discharge from the plant room is through the means of simple openings relying on thermal effects, the minimum
free areas of the openings and any associated grilles should be as specified for natural ventilation (see Section 9.1:
COMBUSTION VENTILATION). The ventilation openings shall be at high level and the air supply shall be at low level.
NOTE:
VENTILATION MUST NOT BE PROVIDED THROUGH NATURAL INLET AND MECHANICAL EXTRACT AS THIS
WILL CAUSE A NEGATIVE PRESSURE WITHIN THE PLANT ROOM AND MAY LEAD TO THE PRODUCTS OF
COMBUSTION BEING DRAWN INTO THE PLANT ROOM.
Appliance Type
Without draught diverters.
(with or without draught stabilisers)
9.3.1
WORKED EXAMPLE – MECHANICAL INLET/NATURAL DISCHARGE
Lochinvar CP-M+100
Heat input (net):
Minimum combustion air flow rate:
Ventilation grille size (high level):
Enclosure/Compartment
Input
(Direct to Outside)
(Net)
High
kW
(cm
)
2
56.0
280
74.0
370
92.0
460
111.0
555
138.0
690
166.0
830
TABLE 9.3
COOLING VENTILATION REQUIREMENTS
Minimum Inlet Air
(Combustion, Ventilation)
TABLE 9.4
MECHANICAL VENTILATION FLOW RATES
Enclosure/Compartment
(To Internal Space)
Low
High
(cm
)
(cm
)
2
2
280
560
370
740
460
920
555
1110
690
1380
830
1660
Flow rate per kW total rated net input (m
Difference between Inlet and Extract
(Inlet minus Extract Ventilation)
2.60
=
92.0 x 2.6 m
/h
3
Boiler Room
Low
High
(cm
)
(cm
)
2
2
560
N/A
740
148
920
184
1110
222
1380
276
1660
332
/h)
3
Air
1.35 ± 0.18
=
92.0 kW
=
239.2 m
=
184 cm
Low
(cm
)
2
N/A
148
184
222
276
332
/h
3
2
32
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