Any air intake terminal MUST be installed in accordance
with the appropriate regulation.
As a guide, the BS5440 series of British Standards
deals with this issue and currently states that an air
intake must be at a minimum distance of 300mm from a
gas boiler balanced flue. Installers are advised to be
aware of the requirements of this standard when
installing ‘through the wall’ supply air ducting.
Similarly, supply and extract air grilles should be
at least 300mm apart.
2
Leaflet Number 671365 October 2009
Installation and Maintenance
mrXbox70 Mechanical Ventilation with Heat Recovery
1. Mounting bracket.
2. Unit motor pod.
3. Heat exchanger pod.
Figure 6. Main unit components.
4. Heat exchanger.
Four smooth operating runners located on each
corner of the heat exchanger provide sealing and
ease of removal.
5. Access cover.
595
485
637
Bracket
fixing
VIEW FROM FRONT WITH COVER REMOVED
SIDE VIEW
MOUNTING BRACKET FRONT VIEW
Mounting bracket
340
250
4 holes
7.5mm dia.
3 x side spigot
knockouts
100mm dia.
6 x top spigot
knockouts
2 x 100mm dia.
4 x 125mm dia.
3 x side
spigot
knockouts
100mm dia.
VIEW FROM TOP
Mounting bracket
1
5
3
2
6
4
7
8
9
Condensate Drain
Terminator
Block
Condensate Tray
3.0 Dimensions
Figure 8. Dimensions in mm.
Installation cont.
Before the unit is used
A bead of silicone is to be
applied along the edge
between the drip tray and
the heat exchanger.
This is to prevent any
water from running down
between the drip tray and
the heat exchanger. If this
seal is broken at any time in
the future then it must be
resealed with silicone. The fixing screw in the drip
tray must also be sealed with silicone.
Condensate Drain
The condensate drain tube protrudes from the
base of the unit (see figure 8). The condensate
should be disposed of via a water
trap connection to the outside of
the property or connected to
the house sewage system.
Spigot location and
airflow:
Supply air to house -
spigots 1, 5, and 7.
Extract air to outside -
spigot 3.
Fresh air from outside -
spigot 4.
Extract from kitchen/
bathroom etc -
spigots 2, 6, 8 and 9.
1
5
3
7
9
8
2
6
4
Figure 7.