Boiler room
17
5
Boiler room
Installation of the boiler
The boiler may only be installed in dry surroundings.
The permitted ambient temperatures are between 5
and 30 °C.
The boiler may only be installed on a flat, non-
combustible surface. The distance of flammable
materials in the immediate vicinity of the boiler must be
heeded in accordance with national regulations.
Requirements for the boiler room
Boiler rooms must be built with fire-resistant F90
(EI90) walls and ceilings; in Switzerland El30 up to 70
kW and EI60 over 70 kW.
An escape door to a corridor or to the outside is
required. The door F30 (El30) must open in the
direction of escape and be self-closing with a tight
seal. Boiler room doors that open onto escape routes
must be EI90 (F90).
The boiler room must feature air inlet and outlet vents
with minimum diameters for the boiler.
To prevent flue gases from escaping, it must be
ensured that negative-pressure does not occur in the
boiler room. Building installations, such as suction for
the ventilation system or installed compressors, for
example, are thus not permissible.
Floor characteristics
The boiler and the external ash removal may only be
installed on a flat, non-combustible floor. The floor
must be capable of supporting the boiler's weight. For
more information see the chapter
Sufficient lighting in boiler room
The boiler room must have lighting sufficient for the in-
stallation and commissioning of the boiler.
There must be no heating appliances in the vicinity
of escape routes
Boilers may not be installed in stairwells, corridors or
rooms through which escape routes lead to the
outside.
Free minimum cross sections for the air intake
openings
The boiler requires air for combustion. That is why free
minimum cross sections are required in the boiler room
for the air intake openings. In Austria, these are
defined in ÖNORM H 5170, see the following table.
Tab. 5-1: free minimum cross sections
A protection grille at the air intake opening also
reduces the free cross section. Therefore, the air
inlet opening must be larger depending on the
protection grill. In air ducts through channels a
calculation by a specialist is required.
The values listed may vary from country-specific and
national regulations. Enquire about it at your authori-
ties. If no rules exist, we recommend the Austrian
minimum cross sections to use as a guide.
Too small-sized air inlet openings may result to
low pressure in the boiler room. This can lead to
a reduction of the boiler output, as well as to an exit of
flue gas in the boiler room.
Boilers that are operated with an external air
supply require no further supply air and outlet
openings in the boiler room.
Boiler
output
[kW]
Free minimum cross sections in cm²
Austria
(specifica-
tion from
ETA)
Germany
Switzer-
land
20
400
150
206
30
400
150
309
40
400
150
412
50
400
150
515
60
400
170
618
70
400
190
721
90
400
230
927
110
440
270
1133
130
520
310
1339
180
720
410
1854
200
800
450
2060
350
1400
750
3605
500
2000
1050
5150
