General Information
900079-02J, 05/2019
Innovative Hearth Products
DRL3000 Linear Direct-Vent Gas Fireplaces
13
VENT TERMINATION CLEARANCES
The following vent termination figures and charts should be used. Install venting according to local codes, these
instructions, the current National Fuel Gas Code (ANSI Z223.1/NFPA 54) in the USA or the current standards of CAN/
CGA-B149.1 in Canada.
Vertical Vent Termination Clearances
Terminate multiple vent terminations according to the installation codes listed above and
Figure 4
.
Figure 4 - Multiple Terminations
12”
(305 mm)
minimum
Terminate single vent caps relative to building components according to
Table 6
and
Figure 4
.
Table 6 - Termination Heights for Vents above Flat or Sloped Roofs (NFPA 54 / ANSI Z223.1)—Gas Vent Rule
Roof Pitch
Termination Height *
Flat to 6/12
1.0 ft (0.3 m)
6/12 to 7/12
1.25 ft (0.38 m)
7/12 to 8/12
1.5 ft (0.46 m)
8/12 to 9/12
2.0 ft (0.61 m)
9/12 to 10/12
2.5 ft (0.76 m)
10/12 to 11/12
3.25 ft (0.99 m)
11/12 to 12/12
4.0 ft (1.22 m)
12/12 to 14/12
5.0 ft (1.52 m)
14/12 to 16/12
6.0 ft (1.83 m)
16/12 to 18/12
7.0 ft (2.13 m)
18/12 to 20/12
7.5 ft (2.29 m)
20/12 to 21/12
8.0 ft (2.44 m)
12
X
Roof pitch is X/12
2 ft
minimum
2 ft minimum
Lowest
discharge
opening
H*
*H = minimum height from roof to
lowest discharge opening of vent
Horizontal overhang
Vertical
wall
Vent
termination
Storm collar
Concentric
vent pipe
Flashing
1” (26 mm) minimum
clearance to combustibles
Horizontal Vent Termination Clearances
The horizontal vent termination must have a minimum of 6” (152 mm) clearance to any overhead combustible
projection of 2-1/2” (64 mm) or less
(
Figure 5
)
. For projections exceeding 2-1/2” (64 mm)
(
Figure 5
)
. For additional
vent location restrictions refer to
Table 7
.
All horizontal terminations may be located as close as 6” (152mm) to any (non-combustible and combustible)
exterior sidewall. This distance may be decreased to 2” (51mm) for noncombustible exterior sidewalls with
SV4.5HT-2 termination
(
Table 7
)
.
Figure 5 - Horizontal Vent Termination Clearances
NOTE:
See
Figure 25
on
Page 31
for exterior wall
recess allowances for the
SV4.5HT-2 termination.
Combustible projection 2-1/2”
or less in length
Combustible projection
greater than 2-1/2” in length
Ventilated
soffit Unventilated
soffit
18”
(457 mm)
12”
(305 mm)
6
(152)
Termination kit
Termination kit
6”
