35
Installation
Connections
Air- / flue gas ducts - installation variants for multiple boilers
Opting for a collective flue gas outlet
is determined by:
- The position of the boilers with
regard to their outlet area
- Sufficient space above the boilers
- Number of boilers
You may opt for:
- Collective flue gas outlet
under-pressure
- Collective flue gas outlet
over-pressure
In many situations, flue gases cannot
be vented individually because the
installation is indoors. For such
situations, we recommend collective
venting by means of under-pressure or
over-pressure using a flue gas outlet
system. The air supply may also be
supplied collectively, but if the boiler
room is suitable for that purpose it may
also be obtained from the boiler room
(`open device` Boiler category B).
If you install a common duct providing
combustion air to more than one
appliance, there is a risk that
combustion air would be drawn from an
other appliance.
This may then be subject to a
negative pressure.
In the case of collective venting
of flue gases, the flue gas-venting
outlet always has to end up in the
open area (outlet area 1).
0,2 x
2 x B
Boiler category: B
Outlet area 1
(free outlet area)
Boiler category: C
Permitted only when the air
intake and the flue gas
outlet are in the same
pressure area
