Vent Termination Clearances - Lennox Merit Series MLDVTCD-35NE Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MERIT

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) in the USA or
the current standards of CAN/CSA-B149.1 in
Canada.
Vertical Vent Termination Clearances
Terminate multiple vent terminations according
to the installation codes listed above. Also see
Figure 4A.
Terminate single vent caps relative to building
components according to Figure 4B.
12"
(305mm)
Minimum
Figure 4A - Multiple Terminations
6
SERIES DIRECT-VENT CONTEMPORARY DESIGN GAS FIREPLACES • MODEL MLDVTCD-35 • INSTALLATION INSTRUCTIONS
®
Vertical Vent Termination Clearances
TERMINATION HEIGHTS FOR VENTS ABOVE
FLAT OR SLOPED ROOFS
Horizontal Overhang
2 FT MIN.
Vent
Termination
Storm Collar
Flashing
Concentric
Vent Pipe
The vent / air intake termination clearances
above the high side of an angled roof is as
shown in the following chart:
Figure 4B
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. See Figure 5. For projections exceeding 2-1/2"
(64 mm), see Figure 5. For additional vent location restrictions refer to Figure 6 on Page 7.
Combustible Projection greater
than 2-1/2 inches in length
Ventilated
Soffit
Unventilated
18"
(457 mm) (305 mm)
Side Elevation View
Figure 5
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
2 FT
Vertical
MIN.
Wall
Lowest
Discharge
Opening
H*
X
12
Roof Pitch is X/12
1 inch (25.4 mm) Minimum
Clearance to Combustibles
*H = MINIMUM HEIGHT FROM ROOF TO
LOWEST DISCHARGE OPENING OF VENT
Horizontal Vent Termination Clearances
Combustible Projection
2-1/2 inches or less in length
Soffit
6"
(152 mm)
12"
Termination Kit
Note - See Figure 28 on Page 19 for the exterior wall recess
allowances of the square horizontal termination.
Termination Heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1
Roof Pitch * Feet
Flat to 6/12 1.0
6/12 to 7/12 1.25
7/12 to 8/12 1.5
8/12 to 9/12 2.0
9/12 to 10/12 2.5
10/12 to 11/12 3.25
11/12 to 12/12 4.0
12/12 to 14/12 5.0
14/12 to 16/12 6.0
16/12 to 18/12 7.0
18/12 to 20/12 7.5
20/12 to 21/12 8.0
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 non- -
combustible exterior
sidewalls only, if the
SV4.5HT-2 termination
is used.
Termination Kit
* Meters
0.3
0.38
0.46
0.61
0.76
0.99
1.22
1.52
1.83
2.13
2.29
2.44