GARNET DIRECT VENT ROOM HEATER
250-6443B October 7, 2003 Page 23
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GARNET DIRECT VENT ROOM HEATER
250-6443B October 7, 2003 Page 24
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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.
4. Each 90° elbow is equivalent to 3' of vent pipe and each 45° elbow is equivalent to 1' 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'
run. Each additional 90° elbow reduces the maximum horizontal distance by 3'
.
Example: The use of 3 elbows would reduce the allowable
horizontal run to 9' (3 - 1 = 2 elbows x 3' = 6';
15' max. - 6' = 9' max.)
INSTALLATION VENT GRAPH
NOTE: IF YOUR INSTALLATION FALLS WITHIN A SHADED AREA ON THE GRAPH, A DAMPER MUST BE
INSTALLED. SEE INFORMATION ON DAMPER INSTALLATION AND ADJUSTMENT ON PAGE 24.
VERTICAL DISTANCE
FROM APPLIANCE TO
90° ELBOW
EXCEPTIONS
FOR HORIZONTAL INSTALLATIONS
:
T
he maximum horizontal vent run is 6'
(182.8cm)
The maximum horizontal vent run with a
45° elbow is 5' (152.4cm)
No external minimum rise is required.
The minimum horizontal vent run is 6"
(15.2 cm).
For any vertical termination a minimum
of 6' (182.8cm) vertical must be used.
NOTES
The maximum horizontal vent run is 15’
(4.57m) when the vertical vent rise is 10’
(3.05m).
The minimum horizontal vent run is 6”
(15.2cm).
Minimum wall thickness is 4” (10.2cm).
Horizontal sections require a 1/4” (6mm) rise
for every 12” (30.5cm) of horizontal travel.
Exterior Vent Diameter = 6-5/8” (177mm);
Inner Vent Diameter = 4” (10.2cm)
Horizontal sections require noncombustible
support every 3’ (91cm), e.g. plumbing tape.
E
XAMPLE
1
:
If the vertical dimension from the center
line of the flue vent to the center of the 90° elbow is 7’
(2.13m), the horizontal run to the outer wall flange must
not exceed 11’10” (360.8cm)
E
XAMPLE
2
:
If the vertical dimension from the center line
of the flue vent is 21’ (6.4m), the horizontal run to the
outer wall flange must not exceed 7'10" (238.7cm).
35'
34'
32'
30'
28'
26'
24'
22'
20'
18'
16'
14'
12'
10'
8'
6'
4'
2'
6' Minimum
Vertical
Termination
6" Min.
starter pipe.
6' Maximum Horizontal run with no vertical pipe and with 1/4" rise
per foot. Must use HHW2 or 985 Termination Cap.
CL
35' Maximum
Vertical
2' 4' 6' 8' 10' 12' 14' 15'
HHW2
Part No.
841-0670
Part #985
Part #991
or
o
r
HHW2 Part 841-0670
Part #985
Example 1
Example 2
No Damper
in this area
Damper position
CLOSED in this area
Damper position
OPEN in this area
NOTE:
In the Commonwealth of Massachusetts, the word damper shall be replaced with the words flue restrictor.
