24
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 #2.
This is the minimum allowed vent pipe using 4"
stainless steel flex pipe.
The vent pipe must extend past the damper
sealing area by at least 12 inches.
Note: The insulation material must not be al-
lowed to expand to the point that it covers the end
of the flex pipe.
The chimney should be capped with any style
cap that will not allow rain or snow to enter.
In some places in the US and Canada, it is
required that the vent pipe extend all the way to the
top of the chimney. Check your local codes.
Fig.51
venting
#3 Installing into an existing
chimney
#4 Preferred method
This method provides excellent venting for
normal operation and in a fireplace with inadequate
flue space, or a height of over 30 feet. A 3" or 4" PL
vent pipe should be used with the needed swivel
flue stub.
NOTE: The flue stub insulation wrap must still
be used with this method. See page 14, Fig. 27 &
29. With a 100% outside air kit the outside air can
be installed in the same manner as the flue pipe.
kEEP COmbuSTIblES (SuCh AS
grASS, lEAvES, ETC.) AT lEAST 3
FEET AwAY FrOm ThE FluE OuTlET
ON ThE OuTSIdE OF ThE buIldINg.
CAuTION
The chimney top must be capped
to prevent rain and/or snow from
entering the chimney.
Stainless Steel
Outside Air Inlet
Cover
part# 1-10-09542
3" Flex
pipe
12" minimum
Fig.52
18" min.
36"
Chimney top
muST bE SEAlEd
The damper area must be
sealed with a steel plate and it
is recommended that Kaowool,
Mineral wool or an equivalent non
combustible insulation is used on
top of the plate to reduce the pos-
sibility of condensation. Insulation
alone should not be used to seal
the damper opening.
wArNINg
ChImNEY CONNECTOr PIPE mAY NOT
PASS ThrOugh CONCEAlEd SPACES
INCludINg AN ATTIC, rOOF SPACE,
ClOSET, FlOOr Or CEIlINg.
Fiberglass insulation
packed above the
damper opening and
sealed plate. (Not a
Harman product.)
