PRE-INSTALLATION
6 720 821 670 (2018/06)20
4.5 APPLIANCE LOCATION AND CLEARANCES
4.5.1 Installation
This appliance is only suitable for installing internally within a property at
a suitable location onto a fixed, rigid surface at least the same size as the
appliance and capable of supporting the appliance weight.
The appliance must be installed where:
• An engineer can gain clear and safe access to work on the product or
component, including making adequate provision for visual
inspection of flues in voids.
• The homeowner can gain clear and safe access to the controls,
check, top up or reset the appliance.
• Products in loft cavities must have permanent fixed lighting, a
permanent fixed retractable ladder and a fixed floor area sufficient to
allow access for normal use and servicing directly under and around
the product and between and the access hatch.
4.5.2 SERVICING CLEARANCES -
VENTILATED COMPARTMENT
Figure 17 shows the minimum space required to install and service the
appliance in a ventilated compartment.
• If a appliance is installed in a compartment with clearances less than
shown in the tables 14, 15, or 16 ventilation is required. Refer to
table 12 for ventilation requirements.
Fig. 17 Ventilated compartment
4.5.3 COMPARTMENTS:
Follow the requirements of BS6798 and BS5440 Part 2 and note:
• Minimum clearances must be maintained.
• An access door is required to install, service and maintain the
appliance and any ancillary equipment.
• If the appliance is installed in an unventilated airing/storage
cupboard, there is no requirement to make a partition between the
appliance and the storage space as long as the minimum clearances
around the appliance are maintained.
• Ideally, storage should be below the appliance, where the appliance is
mounted in the upper part of the cupboard, whilst maintaining the
clearances given in tables 14, 15, or 16.
4.5.4 APPLIANCE CLEARANCES- UNVENTILATED
COMPARTMENTS
4.5.5 INSTALLATION CLEARANCES - UNVENTILATED
COMPARTMENTS
No surface protection is required against heat transfer
from the appliance.
Vent position To room or internal
space
Direct to outside
High level Min. free area 122cm
2
Minimum free area 61cm
2
Low level Min. free area 122cm
2
Minimum free area 61cm
2
Table 12 Compartment ventilation
* Minimum clearance to removable door
** Minimum clearance required for servicing
Table 13 Minimum clearances
6720643895-121.2Wo
+ 30 mm
above elbow
930 mm 410 mm
20 mm*
600 mm**
5 mm
Using 100 mm
ue kit
1080 mm
Using 125 mm
ue kit
1100 mm
200 mm
5 mm
The tables below show the options for the minimum space required to
install and service the appliance inside an unventilated compartment.
CAUTION: CLEARANCES
▶ Top and bottom clearances must not be reduced
below the values shown in table 14 as they are the
minimum clearances required for servicing.
Unventilated Compartment Installation Clearances (millimetres)
Suggested total unventilated compartment minimum clearances are:
Side Above Below Front (to removable door)
400mm 170mm approx.
(30mm above elbow)
200mm 100mm
Table 14 Minimum unventilated compartment clearances
If Side Clearances are Reduced (millimetres)
If total side clearance is
reduced to: (Combined
left and right
clearances excluding
the appliance)
Increase height
clearances to (approx.):
(Combined top &
bottom clearances
excluding the
appliance)
OR Front clearance
(to removable
door) must be
increased to:
350 441 129
300 523 161
250 617 200
200 717 243
150 856 295
100 1012 358
50 1202 434
Table 15 Reduced side clearances
If Front Clearance is Reduced (millimetres)
If front clearance
(to removable
door) is reduced
to:
Increase overall height
clearances to
(approx.):
(Combined top and
bottom clearances
excluding the
appliance)
OR Increase total side
clearance to:
(Combined left and
right clearances
excluding the
appliance)
50mm 511mm 505mm
25mm 596mm 569mm
Table 16 Reduced front clearances
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