Preparatory Work - Zehnder ComfoAir 70 Montagehinweise

Round mounting block
Intended use
The round mounting block consists of a PVC
pipe and two dust covers (Fig. 1). It is used
to hold the ComfoAir 70 ventilation unit. A
ø
core hole of
be provided through the exterior wall for
installing the PVC mounting block. 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).

Preparatory work

Select a suitable installation location in an
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
Fig. 1 – mounting block
6
270 mm (10 5/8 inch) must
centerline of the core hole). 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.
Core hole drilling
A plumb wall is required (Fig. 2).
The cored hole must be level and horizontal
through the exterior wall.
The cored hole must measure at least
270 mm (10 5/8 inch).
Fig. 2 – core hole drilling