12
Oxford Direct Vent / Natural Vent Gas Heater
3-90-20306762
Figure 10
- Termination clearances.
Venting Requirements - Natural Vent Only
FP567
NVBR/NVBC VENTING RUNS
11/12/97
Venting Runs
Horizontal Run (in feet)
Ver
tical Run (in f
eet)
(Measured from top of the unit bef
ore an
y elbo
w)
A:
Vertical installations up to 36 feet (12m) in
height. Up to an 18 ft. horizontal vent run can be
installed within the vent system using a
maximum of two 90-degree elbows or four
45-degree elbows.
B:
Vertical installations up to 36 feet (12m) in
height. Up to a 24 ft. horizontal vent run can be
installed within the vent system using a
maximum of two 45-degree elbows.
(Ratio = 2/3, Hor./Vert.)
= Acceptable venting configuration
= Unacceptable venting configuration
36
34
32
30
28
26
24
22
20
18
16
14
12
10
8
6
4
2
1 2 4 6 8 10 12 14 16 18 20 22 24
A
B
NOTE: When venting staight vertical, without any
elbow, a minimum of 8 ft. vertical is required
off the top of the stove.
Figure 11
- Vent termination window - Natural Vent ONLY.
NOTE: When using the FSDHAG, the restrictor plate
supplied with the stove is not used.
Outside Corner
Inside Corner
Termination Clearances
Termination clearances for buildings with combustible and noncombustible exteriors.
G =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
F =
Combustible
6" (152 mm)
Noncombustible
2" (51 mm)
G
Balcony -
with no side wall
M =
Combustible &
Noncombustible
12" (305 mm)
M
Balcony -
with perpendicular side wall
M =
24" (610 mm)
P =
20” (508 mm)
M
F
Alcove Applications*
C
D
C
E
V
V
Combustible &
Noncombustible
V
V
V
E
= Min. 6” (152 mm) for
non-vinyl sidewalls
Min. 12” (305 mm) for
vinyl sidewalls
O
= 8’ (2.4 m) Min.
O
P
No.
of Caps
D
Min.
C
Max.
1
3’ (914 mm) 2 x D
Actual
2
6’ (1.8 m)
1 x D
Actual
3
9’ (2.7 m)
2/3 x D
Actual
4
12’ (3.7 m) 1/2 x D
Actual
D
Min.
= # of Termination caps x 3
C
Max.
= (2 / # termination caps) x D
Actual
*NOTE:
Termination in an alcove space (spaces open only on one side and with an overhang) is permitted with the dimensions specified for vinyl or
non-vinyl siding and soffits. 1. There must be a 3’ (914 mm) minimum between termination caps. 2. All mechanical air intakes within 10’ (1 m) of a
termination cap must be a minimum of 3’ (914 mm) below the termination cap. 3. All gravity air intakes within 3’ (914 mm) of a termination cap must
be a minimum of 1’ (305 mm) below the termination cap.
