Dovre ASTRO 3MFP Installation Et Mode D'emploi page 40

3. For connection to outside air via the rear of the
appliance:
a. Create an opening in the base or the log
compartment by removing the panel at the
back of the base or the log compartment; see
following figures.
Depending on the version of the stove the
cover plate is affixed either with springy
clips or with a washer plate. In case of a
spring fixing use a screwdriver to lift the
cover plate out of its groove.
10
b. Connect a so-called 'elbow' hermetically to the
opening in the base or the log compartment so
that it cannot move; see following figure.
The height for the connection through the
wall may vary depending on the elbow
type.
Subject to change because of technical improvements