10 NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
A positive flue connection is providing a seal between the vent pipe or
liner and the existing fireplace chimney for the purpose of preventing
room air passage to the chimney cavity of the fireplace. There are dif-
ferent approved methods to achieve this. See Direct Connect Positive
Flue Connection on this page.
When creating a positive flue connection, a positive flue connector ring
kit is required (sold separately - see Figure 7). The connector ring kit
(listed below) provides a means to directly attach rigid pipe or a flex
pipe adaptor to the flue outlet.
71161 - 6" Positive Flue Connector Ring Kit
Install connector ring kits per instructions provided in kits
Positive Flue
Connector Ring
(sold separately)
Top of Insert
In Back
Figure 7 - Connector Ring Kit
Direct Connect Positive Flue Connection
Required in Canada
See the following instructions for approved methods of achieving a
positive flue connection - See Figure 8.
A qualified installer should evaluate the existing fireplace to determine
the best method for achieving a positive flue connection between the
vent pipe or liner and the existing fireplace chimney. The most common
method for achieving a positive flue connection in masonry fireplaces
is to secure a seal-off plate (i.e. 22-gage sheet steel) in the fireplace
throat using masonry screws. Other acceptable methods include packing
noncombustible material (i.e. high temp fiberglass or ceramic insulation)
around the vent pipe or using a flue adapter. Whatever “seal off” method
is used, it must effectively seal the area to prevent room air passage to
the chimney cavity of the fireplace.
Offset Boxes
Offsets can be handled using an offset box (it aligns flue outlet of insert
with the fireplace flue (see Figure 9). Care should be used to ensure
that this adjustable offset box is oriented so it does not angle down when
positioned on the insert flue outlet (level or slightly up at the outbound
end is recommended).
Figure 8 - Positive Flue Connection
u
A non-combustible seal is required at the damper area (to prevent dilu-
tion air from entering the chimney). See Direct Connect Positive Flue
Connection on this page. A seal-off plate method is shown here.
u
Side View
of Insert
Fireplace
Chimney
Must extend starter
section past the damper
area as a minimum
Figure 9 - Offset Box Dimensions
C/L
C/L
}3-3/4”
Cat. No. H6832, 1/4” to 6-1/4” adjustable
Cat. No. H6833, 6” to 13” adjustable
1-1/2”
5-1/8”
1-1/2”
2-1/8”
H6832 - 17”
H6833 - 22”
SIDE VIEW
TOP VIEW
6” Dia.
6” Dia. 14-1/16”
w
v
v
w
vTop 6” collar attaches to rigid pipe or flex liner.
wBottom 6” collar attaches to connector ring on insert flue outlet.
6”
Rigid Pipe, Offset Box or
Flex Pipe Adaptor
A full chimney liner
is recommended