AHRI APEX, Installation, Operating And Service Instructions

Page: 16 / 124

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Table 4: Vent/Combustion Air System Options
IV. Venting
A. General Guidelines (continued)
Approved Direct
Vent System
Vent
Material
Orientation Termination Description Figures
Component
Table
Part
Factory Standard
Two-Pipe,
CPVC/PVC Vent and
PVC Air Intake
CPVC/PVC
Horizontal
Standard
(through sidewall)
The system includes separate CPVC vent
pipe and PVC air intake pipe terminating
through sidewall with individual
penetrations for the vent and air intake
piping and separate terminals (tees).
4, 5A, 5B
9 through 13
7A
B.
Optional
Snorkel
(through sidewall)
Same as above but separate snorkel type
terminals.
4, 6A, 6B
9 through 13
7B
Optional
Vertical
Vertical
(through roof)
The system includes separate CPVC vent
pipe and PVC air intake pipe terminating
through roof with individual penetrations
for the vent and air intake piping and
separate vertical terminals.
7 through 11
13
7C
Available Optional
Two-Pipe, Rigid
Polypropylene Vent (or
Flexible Polypropylene
Liner for Vertical
venting only) and Rigid
Polypropylene or PVC
Pipe Air Intake
Rigid
Polypropylene
(or Flexible
Polypropylene
Liner for vertical
Venting only)
Horizontal
Standard
(through sidewall)
The system includes separate Rigid
Polypropylene vent pipe and Rigid
Polypropylene or PVC air intake pipe
terminating through sidewall with individual
penetrations for the vent and air intake
piping and separate terminals (tees).
4, 5A, 5B
9, 12, 14
10A, 10B
C.
Optional Snorkel
(through sidewall)
Same as above but separate snorkel type
terminals.
4, 6A, 6B
9, 12, 14
10A, 10B
Optional
Vertical
Vertical
(through roof or
chimney/chase)
The system includes separate Flexible
Polypropylene vent liner and Rigid
Polypropylene vent pipe combination for
venting and Rigid Polypropylene or PVC
air intake pipe terminating through roof
with individual penetrations for the vent
and air intake and separate terminals.
7 through 9
14, 15
10A, 10B
Available Optional
Two-Pipe,
Stainless Steel Vent and
PVC/Galvanized Steel
Air Intake
Stainless Steel
Horizontal
Standard
(through sidewall)
The system includes separate stainless
steel vent pipe and PVC/galvanized
steel air intake pipe terminating through
sidewall with individual penetrations for
the vent and air intake piping and separate
terminals.
4, 5A, 5B
9, 12, 16
11A, 11B D.
Optional Snorkel
(through sidewall) Same as above but separate snorkel type
terminals.
4, 6A, 6B
9, 12, 16
Vertical
Vertical (through
roof)
The system includes separate stainless
steel vent pipe and PVC/galvanized
steel air intake pipe terminating through
roof with individual penetrations for the
vent and air intake piping and separate
terminals.
7 through 9
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Table 5: Vent/Combustion Air Pipe Length – Two-Pipe Direct Vent System Options
CPVC/PVC
Polypropylene (PP) or Polypropylene (PP)/PVC
Stainless Steel/PVC or Galvanized Steel)
Boiler
Model
Combustion Air Vent
Nominal
Pipe
Diameter
Minimum
Equivalent
Length
Maximum
Equivalent
Length
Nominal
Pipe
Diameter
Minimum
Equivalent
Length
Maximum
Equivalent
Length
APX425
4 in.
(100 mm or 110 mm)
2.5 ft.
(760 mm)
100 ft.
(30.5 m)
4 in.
(100 mm or 110 mm)
2.5 ft.
(760 mm)
100 ft.
(30.5 m)
APX525
APX625
6 in.
(150 mm or 160 mm)
2.5 ft.
(760 mm)
200 ft.
(61.0 m)
6 in.
(150 mm or 160 mm)
2.5 ft.
(760 mm)
200 ft.
(61.0 m)
APX725
APX825