3 | Design Information
12
M1820921_en | Installation instructions Dual fuel boiler SP Dual compact
3.5 Combustion air
1
2
4
3
1
Boiler in room air-dependent operation
2
Air extraction system (such as centralised dust extraction system, room ventilation)
3
Under-pressure monitoring system
4
Combustion air supply from outside
3.5.1 Combustion air supply at the installation room
The system is operated in open flue mode, i.e. the combustion air required to operate the
boiler is drawn from the installation room.
Requirements:
▪ Opening to the atmosphere
– Weather conditions must not affect the air flow in any way (e.g. snow and foliage)
– Cross-section area free of obstructions such as cover gratings and slats
▪ Air supply lines
– For air supply lines longer than 2 metres and where mechanical means are used
to feed combustion air, the flow rate must be calculated (maximum flow rate = 1 m/
s)
Note on standards
ÖNORM H 5170 - Construction and fire protection requirements
TRVB H118 - Technical directives on fire protection/prevention
