Harman Stove Company Accentra Service Training page 11

XXV Top Flue Option
Attaches to the exhaust on the rear of the stove, and
extends it to the top with a six inch stub.
This gives the appearance of a wood stove and also
allows venting with existing single wall, connector.
A 12 inch piece of 4"PL vent is included to act as
an insulator.
Harman Pellet Service Training 11