DVFH34, DVFH34P
GENERAL VENTING Continued
N
N 
D
E 
V
B L 
| C |
|
| Fixed | V |
| Closed | |
|
| |
F | Openable |
|
V |
|
B
Openable Fixed
Closed
H
V
B
I
G
B |
B |
V J X | G |
A
M
V 
K 
X
V
G V A
V TERMINATION CAP | X AIR SUPPLY INLET | G | GAS METER |
|
RESTRICTED AREA 
(TERMINATION PROHIBITED)
A= clearance above grade, veranda, porch, deck, or balcony [*12 inches (305mm) minimum]
B= clearance to window or door that may be opened
[12 inches (305mm) minimum]
C = clearance to permanently closed window [minimum 12 inches (305mm) recommended to prevent condensation on window]
D = vertical clearance to ventilated soffit located above the terminal within a horizontal distance of 24 inches (610mm) from the
E= clearance to unventilated soffit [12 inches (305mm) minimum]
F= clearance to outside corner (see below)
G= clearance to inside corner (see below)
H= *not to be installed above a meter/regulator assembly within
36 inches (914mm) horizontally from the
I= clearance to service regulator vent outlet [*72 inches (1829mm) minimum]
J= clearance to
K= clearance to a mechanical air supply inlet [*72 inches (1829mm) minimum]
L= † clearance above paved
M= clearance under veranda, porch, deck [*12 inches (305mm) minimum ‡]
N= clearance above a roof shall extend a minimum of 24 inches (610mm) above the highest point when it passes through the roof surface and any other obstruction within a horizontal distance of 18 inches (457mm)
† vent shall not terminate directly above a
‡ only permitted if veranda, porch, deck or balconey is fully open on a minimum of 2 sides beneath the floor*
* as specified in CAN/SGA B149 (.1 or .2) Installation Codes (1991) for Canada or for U.S.A. installation follow the current National Fuel Gas Code, ANS Z223.1
Note: Local codes or regulations may require different clearances
Termination Clearances for Buildings with Combustible and Noncombustible Exteriors
Inside Corner
A |
| A = 6" (152mm) |
|
V
Outside Corner
V
B 
B = 6" (152mm)
Recessed Location
D 
C | C |
E
V
Balcony with No Side Wall
G |
V |
G = Combustible 24" (610mm) Noncombustible 18" (457mm)
Balcony with Perpendicular Side Wall
H
V
J 
Combustible &
Noncombustible
H = 24" (610mm)
J = 20" (508mm)
C = Maximum depth of 48" (1219mm) for recessed location
D = Minimum width for back wall of recessed location - Combustible - 38" (965mm) Noncombustible - 24" (610mm)
E = Clearance from corner in recessed location- Combustible - 6" (152mm) Noncombustible - 2" (51mm)
Figure 8 - Minimum Clearances for Vent Terminations
6 | 106394 |
