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883-90-30007474Vermont Castings • Intrepid DV-IFT Owner’s Manual_R28 • 11/23
Horizontal Termination
Except for straight-through the wall vent installations. The
vent must rise vertically a minimum of 24” (610 mm) after
the rst elbow directly o󰀨 the back of the unit, before the
next elbow. The horizontal run may extend up to 20’ (6 m)
and include a vertical rise of up to 40’ (12 m), Figure 2.8.
Horizontal termination must also meet the criteria
shown in Figures 2.10 and 2.11.
Approved vent systems must terminate above and
including the heavy line, Figure 2.8.
Two 45° elbows may be substituted for each single 90˚
elbow.
With a rise between 2’ - 5’, one 90° or two 45° elbows
may be used (Excluding the rst elbow directly o󰀨 the
back of the unit.
24" maximum horizontal termination directly o󰀨 back.
Corner installation using 45° elbow, maximum horizontal
after elbow is 24 inches.
F.GasSpecications G. Vent Terminations & Clearances
GasSpecications
Model Fuel
Gas
Control
Max.
Input
BTU/h
Min.
Input
BTU/h
INDVR Series Nat Millivolt 17,000 12,500
INDVR Series LP Millivolt 16,000 12,000
INDVR-IFT Nat IFT 17,000 12,500
INDVR-IFT LP IFT 16,000 12,000
The installation must conform with local codes or, in the
absence of local codes, with the National Fuel Gas Code,
ANSI Z223.1/NFPA 54 - latest edition. (EXCEPTION:
Do not derate this appliance for altitude. Maintain the
manifold pressure at 3.5” w.c. for Natural Gas and 10”
w.c. for Propane.)
High Elevations
Input ratings are shown in BTU per hour and are
certiedwithoutderationforelevationsupto4,500
feet(1,370m)abovesealevel.
For elevations above 4,500 feet (1,370m) in USA,
installationsmustbeinaccordancewiththecurrent
ANSI Z223.1/NFPA 54 and/or local codes having
jurisdiction.
In Canada, please consult provincial and/or local
authorities having jurisdiction for installations at
elevationsabove4,500feet(1,370m).
Air Shutter Setting
Minimum injector air inlet opening
Model Natural Gas LP(Propane)
INDVR Series 1/2 Open 1/2 Open
Gas Inlet and Manifold Pressures
Natural Gas LP(Propane)
Inlet Minimum 5.0" W.C. 11.0" W.C.
Inlet Maximum 14.0" W.C. 14.0" W.C.
Manifold Pressure 3.5" W.C. 10" W.C.
Improper installation, adjustment, alteration, service
or maintenance can cause injury or property damage.
Refer to this manual for correct installation and
operational procedures. For assistance or additional
information consult a qualied installer, service
agency, or the gas supplier.
WARNING
!
Figure 2.8 - Horizontal vent termination window.
20
19
18
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
Vertical Run (in feet)
Measured after the first elbow. (Transition elbow)
Horizontal Run (in feet)
21
22
23
24
25
26
27
28
29
30
ST134a
FDV28
Horizontal
vent run
12/3/99 djt
areas modified
1/11/00 djt
May use up to
four 90° Elbows
(Including elbow
directly o󰀨 back of
unit.)
Two 90°
Elbows
Unacceptable
Venting Conguration
Unacceptable
Venting Conguration
8


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