Harman Stove Company Accentra-2 Installation And Operating Manual page 16

This method provides excellent venting for nor-
mal operation. This method also provides natural
draft in the event of a power failure. If the chimney
condition is questionable you may want to install a
liner as in method #7.
This method provides excellent venting for nor-
mal operation. This method also provides natural
draft in the event of a power failure.
The damper area must be sealed with a steel
plate or fiberglass. A cap should be installed on the
chirr~ney to keep out rain. If the chimney condition is
questionable you may want to install a liner all the
way to the top as in Method #6.