SECTION 6: V
ENTING
13
Figure 7: Separated Combustion Heater - Vertical and Horizontal Vent Termination
Figure 8: Concentric Vent Box
V
ent
Termination
12" (31 cm)
Minim
u
m from
air inlet to
v
ent
termination (may
b
e
horizontal or
v
ertical
clearance).
Air Intake
Termination
V
ent
Air Intake*
Vertical
Option
Horizontal
Option
90°
Bend
12" (31 cm)
Minim
u
m from
w
all
to
v
ent termination.
12" (31 cm) Minim
u
m from air inlet to
v
ent termination (may
b
e horizontal
or
v
ertical clearance).
Listed Thim
b
le
thro
u
gh Com
bu
sti
b
le
W
all
V
ent
Air Intake
Condensate
Trap to Drain
(Optional)
NOTE
:
V
ent s
u
pports not
sho
w
n. D
u
ct s
u
pports
not
sho
w
n. D
u
ct and
v
ent s
u
pports not
pro
v
ided
b
y the
man
u
fact
u
rer.
12" (31 cm)
Minim
u
m from
w
all to
v
ent
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
W
all
V
ent Pipe
(By Others)
Seal joint
b
et
w
een single
w
all
and Type B
v
ent
w
ith
silicone sealant.
Use 3 sheetmetal
scre
w
s e
qu
ally
spaced aro
u
nd joint.
Use 3 sheetmetal
scre
w
s e
qu
ally
spaced aro
u
nd collar.
Concentric
V
ent Box
6" (15 cm) Single
W
all Inlet Air Pipe
(By Others)
One piece of 4" (1
0 cm) dia, 1/4" (6 cm)
airspace t
ype “B”
v
ent. Selkir
k Model R
V
or e
qu
i
v
alent.
(By other
s)
Com
bu
stion Air
to Heater
To
w
ard
O
u
tside
Exha
u
st
from Heater
4" (10 cm) or
5" (13 cm)
