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D. How to Use the Vent Graph
1.
Measure the vertical distance from the center line of the
flue pipe to the center of the 90° elbow. On the graph
below, draw a horizontal line from that measurement
on the vertical axis across until it intersects with the
slanted line.
2.
From the point of this intersection, draw a vertical line to
the bottom of the graph.
3.
The point at which this line meets the bottom line of the
graph is the maximum length of the horizontal run.
EXAMPLE 1: If the vertical dimension from the center line
of the flue vent to the center of the 90° elbow is 7 ft. (2m),
the horizontal run to the outer wall flange must not exceed
9 ft.-8 in. (3m).
EXAMPLE 2: If the vertical dimension from the center line
of the flue vent is 21 ft. (6m), the horizontal run to the outer
wall flange must not exceed 4 ft.-3 in. (1m).
4. Each 90° elbow is equivalent to 3 ft. (914mm) of vent
pipe and each 45° elbow is equivalent to 1 ft. (305mm)
of vent pipe, and must be subtracted from the vent pipe
run. A single horizontal to vertical 90° elbow is already
calculated into the allowable 15 ft. (5m) run. Each
additional 90° elbow reduces the maximum horizontal
distance by 3 ft. (914mm).
EXAMPLE: The use of 3 elbows would reduce the allowable
horizontal run to 9 ft. (3 -1 = 2 elbows x 3 ft. = 6 ft.; 15 ft.
max. - 6 ft. = 9 ft. max.).
Maximum Vertical
VERTICAL DISTANCE
FROM APPLIANCE TO
90° ELBOW
6 ft. (2m) Minimum
Vertical Termination
C L
Figure 5.2
September 1, 2008
25 ft. (8m)
25'
24'
22'
Example 2
20'
18'
Adjust
Intake
16'
Damper
14'
12'
10'
Example 1
8'
6'
4'
2'
2'
6 in. (152mm)
Minimum starter pipe
Quadra-Fire · Garnet-T · 7016-127F
E. Venting Guidelines
The maximum horizontal vent run is 15 ft. (5m) when the
vertical vent rise is 10 ft. (3m).
Horizontal sections require a 1/4 in. (6mm) rise for every 12
in. (305mm) of horizontal travel.
Exterior Vent Diameter = 6-5/8 in. (168mm); Inner Vent
Diameter = 4 in. (102mm)
Horizontal sections require noncombustible support every 3
ft. (914mm), e.g. wall straps.
For any vertical termination a minimum of 6 in. (152mm)
vertical must be used.
FOR HORIZONTAL INSTALLATIONS:
he maximum horizontal vent run is 30 in. (762mm).
T
The maximum horizontal vent run with a 45° elbow is 18
in. (457mm).
No external minimum rise is required.
The minimum horizontal vent run is 6 in. (152mm).
NOTE: If your installation falls within the gray-shaded
area on graph, see information on intake damper
operation, on page 36.
*In the Commonwealth of Massachusetts, the word damper
shall be replaced with the words flue restrictor.
Install Flue
Restrictor
4'
6'
8'
10'
12'
Termination Cap
30 in. (762mm) Maximum Horizontal run with no
vertical pipe and with 1/4 in. (6mm) rise per foot.
Must use approved Termination Cap.
NOTES
EXCEPTIONS
Termination
cap
14' 15'
Page 11
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