14
Heat Recovery Unit ILOX 129 - Installation, Operation and Maintenance
FläktGroup DC_10201GB_20190207_R2 We reserve the right to make changes without prior notice
DUCT CONNECTION
Exhaust air from the unit may only be connected to a ventilation duct
intended for this purpose. Connection must not be made to a smoke or
gas flue. In case of extract air ventilation in premises where a smoke
or gas flue is used (for instance, an open fireplace or heating stove),
an adequate supply air flow must be ensured A kitchen flue must be
installed in accordance with applicable regulations.
DUCT CONNECTION, DUCT INSULATION
Note! During installation, the instructions regarding unit installation and duct insulation must be adhered to without deviation.
Otherwise, there is a risk of condensation and moisture resulting in major damage.
DUCT INSULATION
In order for the installation of the unit to be effective, it is crucial that
the installation of the ventilation ducts in the unit, as well as the instal-
lation of ducts through external walls containing insulation and vapour
barriers, roofs and joists, is executed in a professional manner. Other-
wise there is a risk of condensation, resulting in moisture damage.
If older units are replaced, it is also necessary to inspect ducts and
duct insulation for damage and ensure they are of adequate quality.
Supply air ducts (T) and extract air ducts (F), i.e. ducts containing warm
air, which are located in unheated spaces, must be insulated. The insu-
lation should be installed externally and have a windproof surface layer.
Outdoor air ducts (U) and exhaust air ducts (A), i.e. ducts filled with cold
air, which are located inside the building’s vapour barrier, must be in-
sulated and have a diffusion-proof (moisture-proof) surface layer. Given
the high degree of heat recovery achieved by the unit, the exhaust air
also gets very cold and must be thermally insulated. Moreover, ducts
which run alongside each other must have a common vapour barrier.
Ducts between the cooker hood, if fitted, and the unit and exhaust air
duct are to be regarded as kitchen flues. This means that particular
measures must be taken; see the table below.
For the designations of the various ducts, see "Duct definitions" on the
next page.
DUCTS IN WARM SPACES (INDOORS)
The temperature of the air
in the duct is above +10 °C The temperature of the air
in the duct is below +10 °C
No insulation
Supply air ducts (T)
Extract air ducts (F)
Outdoor air duct (U)
Exhaust air duct (A)
Supply air duct (T)
Extract air duct (F)
Fire protection
wired mat 30 mm with moisture-proof
surface layer
Takstol Fuktspärr
Fuktspärr
Fuktspärr
Skivan ska bindas
fast vid kanalen.
Min tjocklek 10 cm.
Fuktspärr
DUCTS IN COLD SPACES
Takstol Fuktspärr
Fuktspärr
Fuktspärr
Skivan ska bindas
fast vid kanalen.
Min tjocklek 10 cm.
Fuktspärr
Takstol Fuktspärr
Fuktspärr
Skivan ska bindas
fast vid kanalen.
Min tjocklek 10 cm.
Supply air duct (T) Outdoor air duct (U)
Extract air duct (F) Exhaust air duct (A)
DUCTS IN LOOSE WOOL
All figures in this table are recommended values which apply in central Sweden. Please check for local variations.
RECOMMENDED INSULATION AND VAPOUR BARRIERS FOR DIFFERENT TYPES OF DUCTING
Ducting type Approved material and
location
Duct in a warm space
Insulation
Vapour
barrier Duct in a cold space Insulation Vapour barrier
Exhaust air (flue)
In kitchen Sheet metal, accessible for
inspection Armaflex AF3, 19 mm Yes – –
Between joists and in attic Sheet metal Fire protection E15, Yes Fire protection E15, Only inside
mesh mat 30 mm mesh mat 50 mm building's vapour barrier
Exhaust air (no flue) Sheet metal Mineral wool 25 mm Yes – –
Between joists and in attic Sheet metal Mineral wool 30 mm Yes Mineral wool 30 mm Yes
From tumble dryer Sheet metal Mineral wool 30 mm No Mineral wool 100 mm No
Outdoor air
In kitchen Sheet metal, accessible for
inspection Armaflex AF3, 19 mm Yes – –
Between joists and in attic Sheet metal Mineral wool 60 mm Yes Inside building’s vapour barrier Only inside
Mineral wool 60 mm building's vapour barrier
Supply air Sheet metal No requirements Mineral wool at least 80 mm No
Extract air or equivalent.
The sheet must be bound
tightly to the duct.
Minimum thickness 10 cm.
Vapour barrier
Vapour barrier
Vapour barrier
Vapour barrier