Vent Termination Clearances - Superior Fireplaces MHD 35 Series Installation And Operation Instructions Manual

Innovative Hearth Products
MHD 35/40 Series Direct-Vent Gas Fireplaces

VENT TERMINATION CLEARANCES

These instructions should be used as a guideline and do not supersede local codes in any way. 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 3.
Figure 3 - Multiple Terminations
Terminate single vent caps relative to building components according to Table 6.
Table 6 - Termination Heights for Vents above Flat or Sloped Roofs (NFPA 54 / ANSI Z223.1)—Gas Vent Rule
Horizontal overhang
2 ft minimum
termination
Storm collar
Flashing
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 4). For projections exceeding 2 1/2" (64 mm) (Figure 4). 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 all
approved terminations (Table 7).
Figure 4 - Horizontal Vent Termination Clearances
*10" to center of termination for H1968
12
12"
(305 mm)
minimum
2 ft Vertical
minimum
wall
Lowest
discharge
Vent opening
H*
X
12
Roof pitch is X/12
1" (26 mm) minimum
clearance to combustibles
Concentric
*H = minimum height from roof to
vent pipe
lowest discharge opening of vent
Combustible projection
greater than 2-1/2" in length
Ventilated
soffit - 18"
(457 mm)
*
6"
(153 mm)
Roof Pitch
Flat to 6/12
6/12 to 7/12
7/12 to 8/12
8/12 to 9/12
9/12 to 10/12
10/12 to 11/12
11/12 to 12/12
12/12 to 14/12
14/12 to 16/12
16/12 to 18/12
18/12 to 20/12
20/12 to 21/12
Combustible projection 2
1/2" or less in length
Unventilated
soffit - 12"
(305 mm)
6
(152)
Termination kit
General Information
900414-00 12/2015
Termination Height *
1.0 ft (0.3 m)
1.25 ft (0.38 m)
1.5 ft (0.46 m)
2.0 ft (0.61 m)
2.5 ft (0.76 m)
3.25 ft (0.99 m)
4.0 ft (1.22 m)
5.0 ft (1.52 m)
6.0 ft (1.83 m)
7.0 ft (2.13 m)
7.5 ft (2.29 m)
8.0 ft (2.44 m)
6"
**Use 6-1/2"
Termination kit**
from center of
termination for
all horizontal
terminations
applicable