19
Boiler Build
Approved Direct
Vent System
Vent
Material
Orientation Termination Description Figures
Component
Table
Part
Floor Standing
or Wall Hung
Two-Pipe,
CPVC/PVC
Vent and PVC
air intake
(Factory Standard)
CPVC/PVC
Horizontal
Standard
(thru sidewall)
The system includes separate
CPVC vent pipe and PVC air intake
pipe terminating thru sidewall with
individual penetrations for the vent
and air intake piping and separate
terminals (tees).
4 thru 9 4A
B.
Optional
Snorkel
(thru sidewall)
Same as above but separate snorkel
type terminals.
4, 5A, 5B,
6, 7, 9, 10
4B
Optional Vertical
Vertical
(thru roof)
The system includes separate CPVC
vent pipe and PVC air intake pipe
terminating thru roof with individual
penetrations for the vent and air
intake piping and separate vertical
terminals.
4, 5A, 5B,
6, 9, 11
4C
Floor Standing
Only
Two-Pipe,
Stainless Steel Vent
and PVC/galvanized
steel air intake
(Available Optional)
Stainless Steel
Horizontal
Standard
(thru sidewall)
The system includes separate
stainless steel vent pipe and
PVC/galvanized steel air intake
pipe terminating thru sidewall with
individual penetrations for the vent
and air intake piping and separate
terminals
8, 13
8A & 8B C.
Optional
Snorkel
(thru sidewall)
Same as above but separate snorkel
type terminals.
10, 13
Vertical
Vertical
(thru roof)
The system includes separate
stainless steel vent pipe and
PVC/galvanized steel air intake pipe
terminating thru roof with individual
penetrations for the vent and air
intake piping and separate terminals.
11, 12, 13
Floor Standing
Only
Concentric, Inner
Polypropylene Vent
and Outer Steel Air
intake (Available
Optional)
Polypropylene
Horizontal
Horizontal
(Wall) Terminal
Concentric vent/air pipe terminates
thru sidewall.
14 thru 21
10 D.
Vertical
Vertical (Roof)
Terminal
Concentric vent/air pipe terminates
thru roof.
14, 15,
16, 17,
22 thru 26
Figure 3: Location of Vent Terminal Relative to Windows, Doors, Grades, Overhangs, Meters and Forced Air
Inlets (Concentric Terminal Shown - Two-Pipe System Vent Terminal to be installed in same location -
Two-Pipe System Air Intake Terminal Not Shown)
Table 3: Vent/Combustion Air System Options
IV. Venting (continued)
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