19
DIRECT VENT
INSTALLATIONS
READ AND FOLLOW ALL
INSTRUCTIONS IN THIS SECTION.
FAILURE TO PROPERLY VENT
THIS FURNACE CAN CAUSE
CARBON MONOXIDE POISONING
OR AN EXPLOSION OR FIRE,
RESULTING IN PROPERTY
DAMAGE, PERSONAL INJURY
OR DEATH.
Direct vent installations require a
dedicated combustion air and venting
system. All air for combustion is taken
from the outside atmosphere and all
combustion products are discharged
to the outdoors. Therefore, no
ventilation or combustion air
openings are required.
IMPORTANT: The plastic combustion
air and venting components are of
Schedule 40 PVC. If using ABS
piping ensure that the solvent cement
is compatible for joining PVC to ABS
components or use a mechanical
connection that can withstand the
vent temperatures and are corrosion
resistant.
INSTALLATION GUIDELINES
All exhaust piping must be installed in
compliance with Part 7, “Venting of
Equipment,” of the latest edition of the
National Fuel Gas Code NPFA54/
ANSI Z223.1-, CAN/CGA-B149, local
codes or ordinances and these
instructions.
1. Vertical piping is preferred.
2. All horizontal piping must slope
upward a minimum of
1
/4 inch
per foot of run so that condensate
drains toward the furnace.
3. All horizontal runs must be
supported at least every 4 feet.
No sags or dips are permitted.
4.
IMPORTANT: DO NOT COM-
MON VENT WITH ANY OTHER
APPLIANCE. DO NOT INSTALL
IN THE SAME CHASE OR
CHIMNEY WITH A METAL OR
HIGH TEMPERATURE PLAS-
TIC PIPE FROM ANOTHER
GAS OR FUEL-BURNING
APPLIANCE UNLESS THE
REQUIRED MINIMUM
CLEARANCES TO
COMBUSTIBLES ARE
MAINTAINED BETWEEN THE
PVC PIPE AND OTHER PIPES.
5. All vent runs through uncon-
ditioned spaces where below-
freezing temperatures are
expected should be insulated
with 1-in. thick, medium-density,
foil-faced fiberglass. An
equivalent “arm-a-flex” or “rub-a-
tex” insulation may also be used
as long as there is no heat tape
applied to the vent pipe. For
horizontal runs where water may
collect, wrap the vent pipe with
self-regulating 3 or 5 watt heat
tape. The heat tape must be
!
WARNING
➤TABLE 2
FOR DIRECT VENT APPLICATIONS - AIR FOR COMBUSTION
PROVIDED FROM OUTDOORS
MAXIMUM ALLOWABLE LENGTH IN FEET OF EACH EXHAUST PIPE AND INTAKE AIR PIPE
U.L. listed and installed per the
manufacturer’s instructions.
6. The minimum vent pipe length is
5 feet.
Size the exhaust and combustion air
intake pipes as specified in Table 2.
This table lists the maximum allow-
able length in feet of the exhaust and
combustion air intake pipes that may
be used for all furnace inputs as
related to the number of elbows
required and the termination (see
shaded area).
FURNACE
INPUT
PIPE
SIZE
TERMINATION
VENT TERMINATION
KIT RECOMMENDED
(RXGY-D0* Kits for
Horizontal Venting Only)
1 - 2 3 - 4 5 - 6
NUMBER OF ELBOWS
45° or 90°
Medium / Long Radius ONLY
Standard RXGY-D02 65 60 55
45,000 2” Concentric RXGY-C01/RXGY-E02
55 50 45
Alternate RXGY-D02
Standard RXGY-D02 40 35 30
2” Concentric RXGY-C01/RXGY-E02
30 25 20
Alternate RXGY-D02
60,000
Standard RXGY-D03 120 120 120
3” Concentric RXGY-C01/RXGY-E02
110 105 100
Alternate RXGY-D03
Standard RXGY-D02 20 15 10
2” Concentric Not Recommended
NR NR NR
Alternate Not Recommended
75,000
Standard RXGY-D03 120 120 120
3” Concentric RXGY-C01/RXGY-E02
100 95 85
Alternate RXGY-D03
Standard RXGY-D03 110 105 95
90,000 3” Concentric RXGY-C01/RXGY-E02
50 40 35
Alternate RXGY-D03
Standard RXGY-D03 110 105 95
105,000 3” Concentric RXGY-C01/RXGY-E02
50 40 35
Alternate RXGY-D03
Standard RXGY-D03 105 100 90
120,000 3”
Concentric RXGY-C01/RXGY-E02
45 35 30
Alternate RXGY-D03
Alternate RXGY-D04 105 95 90
NOTES:
1. N.R. - NOT RECOMMENDED.
2. MAXIMUM OF 6 ELBOWS MAY BE USED. DO NOT COUNT ELBOWS IN ALTERNATE TERMINATION KIT.
MEDIUM OR LONG SWEEP ELBOWS MAY BE USED.
3. ➤ A 45 DEGREE ELBOW IS CONSIDERED ONE ELBOW.
4. CONCENTRIC TERMINATION NO. RXGY-C01 IS FOR THRU-THE-WALL VENTING.
5. CONCENTRIC TERMINATION NO. RXGY-E02 IS FOR THRU-THE-ROOF VENTING.
6. USE KITS RXGY-DO2 (2") OR RXGY-D03 (3") FOR STANDARD OR ALTERNATE THRU-THE-WALL VENTING.
7. USE KITS RXGY-D04 FOR ALTERNATE VENTING OF 120,000 BTUH UNITS WITH LONG RUNS.
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