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D
E
L
B
CFM145a
V
Clearance above grade, verenda, porch, deck or
A
balcony
Clearance to a window or door that may be
B
opened
C
Clearance to permanently closed window
Vertical clearance to ventilated soffit located
above the terminal within a horizontal distance
D
of 2 feet (610mm) from the center line of the
terminal
E
Clearance to unventilated soffit
F
Clearance to outside corner
G
Clearance to inside corner (see next page)
Clearance to each inside of center line extended
H
above meter/regulator assembly
I
Clearance to service regulator vent outlet
Clearance to non-mechanical air supply inlet to
J
building or the combustion air inlet to any other
appliances
K
Clearance to a mechanical air supply inlet
Clearance above paved sidewalk or paved
L
driveway located on public property
M
Clearance under veranda, porch, deck or balcony
Clearance above a roof shall extend a minimum of 24" (610mm) above the highest point when it passes through the roof surface, and any other
N
obstruction within a horizontal distance of 18" (450mm).
1 In accordance with the current CSA-B149 Installation Codes
2 In accordance with the current ANSI Z223.1/NFPA 54 National Fuel Gas Codes
† A vent shall not terminate directly above a sidewalk or paved driveway which is located between two single family dwellings and
serves both dwellings
* only permitted if veranda, porch, deck or balcony is fully open on a minimum 2 sides beneath the floor:
NOTE:
1. Local codes or regulations may require different clearances.
2. The special venting system used on Direct Vent appliances are certified as part of the appliance, with clearances tested and approved by the listing
agency.
3. Hearth & Home Technologies assumes no responsibility for the improper performance of the appliance when the venting system does not meet these
requirements.
Figure 9 - Vent termination clearances.
3-90-693831
Hearth and Home Technolgies • Oxford Direct Vent Installation Manual_R6 • 08/17
General Venting Information - Termination Location
A
C
B
V
Fixed
Closed
V
F
V
B
B
VENT TERMINATION
AIR SUPPLY INLET
X
6" (15cm) for appliance
< 10,000 Btuh (3kW). 12" (30cm) for appliances
> 10,000 Btuh (3kW) and < 100,000 Btuh
(30kW), 36" (91cm) for appliances > 100,00
Btuh (30kW) appliances > 50,000 Btuh (15kW)
12" (305mm) recommend to prevent window
condensation.
3' (91cm) within a height if 15' (5m) above the
meter/regulator assembly
6" (15cm) for appliances < 10,000 Btuh (3kW),
12" (30cm) for appliances > 10,000 Btuh (3kW)
and < 100,000 Btuh (30kW), 36" (91cm) for
appliances > 100,000 Btuh (30kW)
INSIDE
CORNER DETAIL
G
V
H
B
V
Fixed
Operable
Closed
B
V
X
J
A
AREA WHERE TERMINAL IS NOT PERMITTED
Canadian Installation
1
CFM145a
DV Termin Location
12" (30cm)
5/01/01 Rev. 12/05/01
sta
18" (458mm)
12" (305mm)
see next page
see next page
3' (91cm)
6' (1.83m)
7' (2.13m)†
12" (30cm)*
N
N
M
X
I
V
K
US Installations
12" (30cm)
6" (15cm) for appliances < 10,000 Btuh (3kW),
9" (23cm) for appliances > 10,000 Btuh (3kW)
and < 50,000 Btuh (15kW), 12" (30cm) for
appliances > 50,000 Btuh (15kW)
12" (305mm) recommend to prevent window
condensation.
18" (458mm)
12" (305mm)
see next page
see next page
3' (91cm) within a height if 15' (5m) above the
meter/regulator assembly
3' (91cm)
6" (15cm) for appliances < 10,000 Btuh (3kW),
9" (23cm) for appliances > 10,000 Btuh (3kW)
and < 50,000 Btuh (15kW), 12" (30cm) for
appliances > 50,000 Btuh (15kW)
3' (91cm) above if within 10' (3m) horizontally
7' (2.13m)†
12" (30cm)*
2
11
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