Hearthstone Quality Home Heating Products, Inc
Bristol Model 8763
12
A listed fire stop is required at any floor
penetration. The opening must be framed in
according
to the venting
manufacturer’s
instructions.
Steep roofs, nearby trees, or predominant ly
strong windy conditions can promote poor draft or
down draft conditions. In this event, an increase
to the height of the vent
may improve
performance.
A maximum of two 90
⁰
or four 45
⁰
elbows may be
used in vertical terminations. Whenever possible
use 45
⁰
elbows instead of 90
⁰
elbows as they
offer less restriction to the flue gases.
All termination caps must be no less than 18”
(457mm) horizontally from any roof or vertical
surface. See Figure 8.
The termination must fall within the chart in Figure
11.
The maximum vertical run
is 35’
The minimum vent/air intake termination clearances
above the high side of an angled roof are as follows:
Roof Pitch
Feet
Meters
Flat to 6/12
1
0.3
7/12 to 9/12
2
0.6
10/12 to 12/12
4
1.2
13/12 to 16/12
6
1.8
17/12 to 21/12
8
2.4
Figure 8 -
Termination Cap clearances
Prefabricated & Fireplace Chimney
Installations
The Bristol 8763 is approved for use with direct vent
chimney conversion kits in masonry or prefabricat ed
solid fuel listed chimneys. The following installation
requirements must be followed:
The termination must fall within the chart shown
in Figure 12.
In a masonry chimney, a fireclay liner or listed
steel liner, must be present the entire length of
the chimney.
The maximum vertical length of vent is 35’.
The liner must have an inside dimension or
diameter 6” or greater.
Prefabricated chimneys must be UL103 or ULC
S-629 listed and have a minimum INSIDE
diameter of 6”. Prefabricated chimneys must be
listed for the specific manufacturer’s conversion
kit.
The use of an existing chimney as an air intake is not
listed under the ANSI Z21.88 / CSA 2.33-2016 test
methods; this installation has been tested and
approved
by OMNI-Test
Laboratories
with an
appropriate
test. The code authority having
jurisdiction must be consulted prior to proceeding with
this installation method. See examples below.
Figure 9
– Existing Chimney Venting Options
