Zehnder ComfoAir 70 Instructions De Montage page 6

Square mounting block
Intended use
The square mounting block consists of an
EPP block (A) with PVC pipe (B) and two dust
covers (Fig. 1). It is used to hold the ComfoAir
70 ventilation unit. For installation, a square
wall opening of at least 280 mm (11 inch) must
be provided through the exterior wall. The final
wall thickness must be within a range of min.
275 mm (10 13/16 inch) to max. 600 mm
(23 5/8 inch) (Fig. 2).
Preparatory work
Select a suitable installation location in the
exterior wall. Ensure that there is sufficient
space available for the ComfoAir 70 to be
mounted and for routine maintenance (at
least 32 cm (12 5/8 inch) on the left, 42 cm
(19 9/16 inch) on the right and 73 cm
(28 3/4 inch) above, all measured from
the centerline of the core hole).
Fig. 1 – EPP block with PVC pipe
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Ensure a minimum clearance of 80 cm
(31 1/2 inch) in front of the interior surface
of the wall to allow for the ComfoAir 70 to
be moved in and out of the PVC pipe during
installation and future maintenance.
Wall opening
The ComfoAir 70 must be installed in a
plumb vertical wall. The wall opening must be
prepared so the EPP mounting block will sit
plumb and level inside the opening.
The wall opening must not compromise
the load-bearing capacity of the wall
and there must be no load transferred to the
EPP mounting block.
Fig. 2 – areas that can be shortened