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SECTION 6: VENTING
13
Figure 7: Separated Combustion Heater - Vertical and Horizontal Vent Termination
Figure 8: Concentric Vent Box
Vent
Termination
12" (31 cm)
Minimum from
air inlet to vent
termination (may be
horizontal or vertical
clearance).
Air Intake
Termination
Vent
Air Intake*
Vertical
Option Horizontal
Option
90°
Bend
12" (31 cm)
Minimum from wall
to vent termination.
12" (31 cm) Minimum from air inlet to
vent termination (may be horizontal
or vertical clearance).
Listed Thimble
through Combustible
Wall
Vent
Air Intake
Condensate
Trap to Drain
(Optional)
NOTE: Vent supports not
shown. Duct supports
not shown. Duct and
vent supports not
provided by the
manufacturer.
12" (31 cm)
Minimum from
wall to vent
termination.
Model Vent Diameter Terminal P/N
UHD[X]S[R] 150 - 400 4" (10 cm) 90502102
Model *Air Intake Diameter Terminal P/N
UHD[X]S[R] 150 - 250 4" (10 cm) 90502102
UHD[X]S[R] 300 - 400 5" (13 cm) 90502105
4" (10 cm) Single
Wall Vent Pipe
(By Others)
Seal joint between single wall
and Type B vent with
silicone sealant.
Use 3 sheetmetal
screws equally
spaced around joint.
Use 3 sheetmetal
screws equally
spaced around collar.
Concentric
Vent Box
6" (15 cm) Single
Wall Inlet Air Pipe
(By Others)
One piece of 4" (10 cm) dia, 1/4" (6 cm)
airspace type “B” vent. Selkirk Model RV
or equivalent. (By others)
Combustion Air
to Heater
Toward
Outside
Exhaust
from Heater
4" (10 cm) or
5" (13 cm)