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11.3
COMBUSTION VENTILATION
When used as a Type C appliance, ventilation for combustion is not necessary as the combustion air is ducted
directly from outside. When used as a Type B appliance, the combustion air requirements are as follows:
GROSS
NET
MODEL
INPUT
INPUT
(KW)
(KW)
TTW410
444
400
TTW580
611
550
TABLE 9.1
11.4
COOLING VENTILATION
When used as a type C appliance, cooling ventilation should be provided as follows:
INPUT
INPUT
MODEL
(GROSS)
(NET)
KW
KW
TTW410
444
400
TTW580
611
550
When used as a type B appliance, provision for cooling ventilation is included in the combustion ventilation
allowance.
PLANT ROOM
LOW
MEDIUM
SUMMER USE
SUMMER USE
HIGH
LOW
HIGH
LOW
(CM
2
)
(CM
2
)
(CM
2
)
(CM
800
1200
1200
2000
1100
2200
1650
2750
COMBUSTION VENTILATION REQUIREMENTS TTW410 – TTW580
ENCLOSURE/COMPARTMENT ENCLOSURE/COMPARTMENT
(DIRECT TO OUTSIDE)
HIGH
(CM
2
)
(CM
2000
2000
2750
2750
TABLE 9.2
COOLING VENTILATION REQUIREMENTS
HIGH
LOW
SUMMER USE
SUMMER USE
HIGH
LOW
HIGH
2
)
(CM
2
)
(CM
2
)
(CM
2
1600
2400
2000
2200
3300
2750
(TO INTERNAL SPACE)
LOW
HIGH
2
)
(CM
2
)
4000
5500
ENCLOSURE
MEDIUM
SUMMER USE
LOW
HIGH
LOW
HIGH
)
(CM
2
)
(CM
2
)
(CM
2
)
(CM
4000
2400
4400 2800 4800
5500
3300
6050 3850 6600
WATER HEATER
ROOM
LOW
HIGH
(CM
2
)
(CM
2
4000
800
5500
1100
HIGH
SUMMER
USE
LOW
2
)
(CM
2
)
LOW
)
(CM
2
)
800
1100
33
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