LAB1283R, Issue 2, Apr 2017
Page 12
2.4.3 Where ducting passes through unheated areas and voids (e.g. loft spaces) it must be
insulated using
Domus Thermal
duct insulation in order to comply with The Building
Regulations. Additionally, both ducts connecting the HRX2D to outside must be insulated
with an additional continuous vapour barrier to avoid condensation forming on the outside
of the ducts
2.4.4 Alternative proprietary duct insulation may be used provided it complies with the 2010
Domestic Ventilation Compliance Guide
2.4.5 When passing through a fire-stopping wall or fire-compartment wall,
Domus FireBrake
intumescent duct connectors should be used in order to maintain the integrity of fire-
stopping walls in accordance with Approved Document B of the Building Regulations
2.4.6 Alternative proprietary fire-stopping methods may be employed provided they comply with
Approved Document B of the Building Regulations
2.4.7 Rigid ducting – install using the least number of fittings to minimise resistance to airflow.
All duct runs should be as short and as straight as possible for maximum performance
with adequate support
2.4.8 Flexible ducting – ensure flexible ducting lengths are kept to a maximum of 300mm and
ducting is pulled taut so that it is smooth and straight. Mechanically fix flexible ducts using
Domus 125-5
hose clips and tape seal using
Domus 50TP45
duct tape or any good
quality
proprietary
duct tape
for added air-tightness
2.4.9 The fresh supply air must be drawn in from the exterior of the property. If drawn through a
wall, a
Domus 905
airbrick should be fitted. If drawn in through a pitched roof a
Domus
4411/4411T
universal roof terminal should be fitted or a proprietary roof terminal designed
for mechanical ventilation with a free area of at least 10,000mm²
2.4.10 The stale extract air must be expelled to the exterior of the property. If expelled through a
wall, a
Domus 905
airbrick should be fitted. If expelled through a pitched roof a
Domus
4411/4411T
universal roof terminal should be fitted or a proprietary roof terminal designed
for mechanical ventilation with a free area of at least 10,000mm²
2.4.11 It is an industry recommendation (TR35) that the fresh supply and stale exhaust external
inlets and outlets should be fitted at least 2m apart to avoid recirculation of stale exhaust
air
2.4.12
Further details regarding duct installation can be found in the 2010 Domestic Ventilation
Compliance Guide.
LAB1283R, Issue 2, Apr 2017
Page 21
Press “
SET
” to record or “
ESC
” to discard the settings and return to the home screen
5.8 Delay-on timer activation/deactivation
From the home screen, press and hold “
SET
” and “
COPY
” simultaneously for 3 seconds
Press “
COPY
” once to move to ‘Menu 5’ ‘Delay-on setting’
The Delay-on setting provides a 3 minute delay before Boost speed is engaged
Use the “
+
” or “
-
“ button to set to ‘on’ or ‘off’
Note: The Delay-on function will always be overridden by automatic humidity sensing
Press “
SET
” to record or “
ESC
” to discard the settings and return to the home screen
5.9 Delay-off timer activation/deactivation
From the home screen, press and hold “
SET
” and “
COPY
” simultaneously for 3 seconds
Press “
COPY
” once to move to ‘Menu 6’ ‘Delay-off setting’
The Delay-off setting provides an adjustable run-on timer when Boost speed is engaged –
adjustable between 5 and 30 minutes or ‘off’
Use the “
+
” or “
-
“ button to set the desired run-on time in 1 minute steps (Factory default is
off)
V E N T I L A T I O N
V E N T I L A T I O N
