Hergom E-20 N Instrucciones Para La Instalación, Uso Y Mantenimiento página 35

1.3.4-CHANGING THE DIRECTION OF THE FLUE
If you prefer to have the chimney flue in the rear, please perform the following operations:
Firewalls

Remove the 4 screws that fix the baffle to the rear section.

Move the baffle slightly forward and then let it slide
down until the tabs that fit it to the sides are free and
then remove.

Now you may easily remove the 4 nuts that hold the entire flue cover
and rear plate protector. Remove nuts and washers, but keep the bolts
in place in order to place the flue ring.

Similarly, release top section flue.

Swap the position of the said parts: Take into account that the arrow
engraved on the bottom of the cast iron cover, (behind the protection
plate) should be placed on the top section facing towards the front.

Tighten the parts to ensure that they are correctly sealed.

Replace the flue assembly and finally do not forget to put the firewall in
place.

Open the fireplace door and remove the cast iron firewall placed
on the baffle. Pull it up to remove it from its position.
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4 screws