28
Table 6 – Vent Termination Kit for Direct Vent/2--Pipe System
DIRECT VENT (2 PIPE) TERMINATION KIT
TERMINATION SYSTEM
DIAMETER OF COMBUSTION AIR AND
VENT PIPES --- IN. (MM)
2---in. (51 mm) Concentric Vent Kit
Single Penetration of Wall or Roof
1, 1---1/2, 2, or 2---1/2
(25, 38, 51, or 64)
3---in. (76 mm) Concentric Vent Kit
Single Penetration of Wall or Roof
2---1/2 or 3 (64 or 76)
2---in. (51 mm)Termination Bracket Kit
2Pipe Termination System
1, 1---1/2 or 2 (25, 38, or 51)
3---in. (76 mm) Termination Bracket Kit
2Pipe Termination System
2---1/2, 3 (64 or 76)
Table 7 – Maximum Allowable Exposed Vent Pipe Length (Ft / M) With Insulation in Winter Design
Temperature Ambient*
UNIT SIZE
WINTER DESIGN
TEMPERATURE (
°
F)
MAXIMUM PIPE
DIAMETER
IN. (mm)
INSULATION THICKNESS --- IN. (mm)†
0
3/8
1/2
3/4
1
060---14
20 (---6.7
°
C
)
2 (51)
30 (9.1)
55 (16.7)
61 (18.5)
70 (21.3)
70 (21.3)
0 (---17.8
°
C
)
2 (51)
16 (4.8)
33 (10.0)
38 (11.5)
46 (14.0)
53 (16.1)
---20 (---28.4
°
C
)
2 (51)
9 (2.7)
23 (7.0)
26 (7.9)
33 (10.0)
38 (11.5)
080---14
080---20
20 (---6.7
°
C
)
2 (51)
37 (11.2)
65 (19.8)
70 (21.3)
70 (21.3)
70 (21.3)
0 (---17.8
°
C
)
2 (51)
20 (6.0)
39 (11.8)
45 (13.7)
55 (16.7)
63 (19.2)
---20 (---28.4
°
C
)
2 (51)
11 (3.3)
27 (8.2)
31 (9.4)
39 (11.8)
45 (13.7)
100---20
20 (---6.7
°
C
)
2---1/2 (64)
41 (12.4)
70 (21.3)
70 (21.3)
70 (21.3)
70 (21.3)
0 (---17.8
°
C
)
2---1/2 (64)
21 (6.4)
42 (12.8)
48 (14.6)
59 (17.9)
68 (20.7)
---20 (---28.4
°
C
)
2---1/2 (64)
11 (3.3)
28 (8.5)
33 (10.0)
41 (12.4)
49 (14.9)
120---20
20 (---6.7
°
C
)
3 (76)
49 (14.9)
70 (21.3)
70 (21.3)
70 (21.3)
70 (21.3)
0 (---17.8
°
C
)
3 (76)
26 (7.9)
51 (15.5)
58 (17.6)
70 (21.3)
70 (21.3)
---20 (---28.4
°
C
)
3 (76)
15 (4.5)
35 (10.6)
40 (12.1)
50 (15.2)
59 (17.9)
* Pipe length (ft) specified for maximum pipe lengths located in unconditioned spaces. Pipes located in unconditioned space cannot exceed total allowable pipe
length as specified in Table 6.
{
Insulation thickness based on R value of 3.5 per in.
NOTE
: Combustion air pipe must have the same diameter as vent
pipe.
Concentric Vent/Combustion Air Termination Kit (Direct
Vent/2--Pipe System Only)
Determine an appropriate location for termination kit using the
guidelines provided in section “Vent Termination: General” in this
instruction.
1. Cut one 4--in. (102 mm). diameter hole for 2--in. (51 mm)
kit, or one 5--in. (127 mm). diameter hole for 3--in. (76
mm). kit.
2. Loosely assemble concentric vent/combustion air termina-
tion components together using instructions in kit.
3. Slide assembled kit with rain shield REMOVED through
hole.
NOTE
: Do not allow insulation or other materials to accumulate
inside of pipe assembly when installing it through hole.
Roof terminations--
Locate assembly through roof to
appropriate height as shown in Fig. 31 and 32.
Sidewall terminations--
Locate assembly through sidewall
with rain shield positioned no more than 1--in. (25 mm)
from wall as shown in Fig. 31 and 32.
4. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping.
5. Check required dimensions as shown.
Two--Pipe Termination Kit (Direct Vent/2--Pipe System Only
Determine an appropriate location for termination kit using the
guidelines provided in section “Vent Termination: General” in this
instruction.
1. Cut 2 holes, 1 for each pipe, of appropriate size for pipe size
being used.
2. Loosely install elbow in bracket and place assembly on
combustion--air pipe.
Roof terminations--
Loosely install pipe coupling on
properly cut vent pipe. Coupling must be positioned so
bracket will mount as shown in Fig. 31.
For applications using combustion--air pipe option,
indicated by dashed lines in Fig. 31, install 90
_
street
elbow into 90
_
elbow, making a U--fitting. A 180
_
U--fitting may be used.
Sidewall terminations--
Install bracket as shown in Fig.
31.
For applications using vent pipe option indicated by
dashed lines in Fig. 31, rotate vent elbow 90
_
from
position shown in Fig. 31.
3. Disassemble loose pipe fittings. Clean and cement using
same procedures as used for system piping.
4. Check required dimensions as shown in Fig. 31.
Multiventing and Vent Terminations
When 2 or more 355BAV Furnaces are vented near each other,
each furnace must be individually vented. NEVER common vent
or breach vent 355BAV furnaces.
(Direct Vent/2--Pipe System ONLY)--When 2 or more 355BAV
furnaces are vented near each other, 2 vent terminations may be
installed as shown in Fig. 31, but next vent termination must be at
least 36 in. (914 mm) away from first 2 terminations. It is
important that vent terminations be made as shown in Fig. 31 to
avoid recirculation of flue gases.
355B
A
V
