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Page 12
August 1, 2008
Heat & Glo · Tiara I B & Tiara II B · 7010-149M
D. How to Use the Vent Graph E. Venting Guidelines
1. Measure the distance from the top of appliance 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 fl ue vent to the center of the 90° elbow is 7 ft. (2m), the
horizontal run to the outer wall fl ange must not exceed 16
ft. (5m).
.
Example 2: If the vertical dimension from the center line of
the fl ue vent is 21 ft. (6m), the horizontal run to the outer wall
fl ange must not exceed 12 ft. 10 in. (4m).
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
20 ft. (6m) 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.; 20 ft.
max. - 6 ft. = 14 ft. max.).
• The maximum horizontal vent run is 20 ft. (6m) when the
vertical vent rise is 10 ft. (3m).
• The minimum horizontal vent run is 6 in. (152mm).
• Horizontal sections require a 1/4 in. (6mm) rise for every
12 in. (305 mm) 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 ft. (2m)
vertical must be used.
Figure 5.2
SLK-01TRD
Example 1
Example 2
2' 4' 6 ' 8' 10' 12' 14' 15' 16' 17' 18' 19' 20'
2'
4'
6'
8'
10'
12
'
14'
16'
18'
20'
22'
24'
26'
28'
30'
32'
34'
35'
36'
37'
38'
39'
40'
Part #SLK-991DA
3 ft. (914mm) Maximum Horizontal run with no vertical pipe
and with 1/4 in. (6mm) rise per foot. Must use Snorkel cap.
Damper position
more CLOSED in
this area
6 ft. (2m) Minimum V ertical T erminatio n
For rear vent or top of
stove for top vent.
C
L
6 in. (152mm) Minimum starter pipe
C
L
40 ft. (12m)
Maximum V ertica l
VERTICA L DIS T ANCE
FROM APPLIANCE T O 90
°
ELBOW
Damper position
more OPEN in
this area
NO Damper in
this area
EXCEPTIONS FOR HORIZONTAL INSTALLATIONS:
*When installing the Tiara I-B or Tiara II-B in a rear vent
configuration with no vertical rise, a Snorkel Kit must be
used. Refer to venting components.
*The maximum horizontal vent run is 3 ft. (914mm).
*The maximum horizontal vent run with a 45° elbow is 2 ft.
(609mm).
*The minimum horizontal vent run is 6 in. (152mm).
NOTE: IF YOUR INSTALLATION FALLS WITHIN A SHADED AREA ON
THE GRAPH, THE DAMPER MUST BE USED.* SEE INFORMATION ON
DAMPER ADJUSTMENT ON PAGE 31.
*In the Commonwealth of Massachusetts, the word damper shall be replaced
with the words flue restrictor.