Nordpeis Q-27FL Manuel D'installation page 22

Connecting from the rear of the insert
Remove the top and rear panels. Swap the connector and cover. Install the connection pipe on the connector;
ensure that gasket does not move out of position. When the insert is in position, seal the connection pipe and wall
connector well, use heat-resistant sealant if necessary. Reinstall the top and rear panels; screw the covers onto the
top panel.
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GB