Vent Termination Clearances - Lennox MPD-3530CNM-B 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 and Figures
4 and 5.
12"
(305mm)
minimum
Figure 4 - Multiple Terminations
6
PLUS DIRECT VENT GAS FIREPLACES (MPD33/35/40/45) • INSTALLATION INSTRUCTIONS
®
Vertical Vent Termination Clearances
TERMINATION HEIGHTS FOR VENTS ABOVE
FLAT OR SLOPED ROOFS
Horizontal Overhang
2 FT
MIN.
2 FT MIN.
Lowest
Discharge
Vent Opening
Termination
H*
Storm Collar
Flashing
Roof Pitch is X/12
1 inch (25.4 mm) Minimum
Clearance to Combustibles
Concentric
*H = MINIMUM HEIGHT FROM ROOF TO
Vent Pipe
LOWEST DISCHARGE OPENING OF VENT
Figure 5
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 6). For projections exceeding 2-1/2"
(64 mm), see Figure 6. For additional vent location restrictions refer to Figure 7 on Page 7.
Horizontal Vent Termination Clearances
Combustible Projection
2-1/2 inches or less in length
Combustible Projection greater
than 2-1/2 inches in length
Ventilated
Soffit
Unventilated
Soffit
18" 12"
(457 mm)
(305 mm)
Side Elevation View
Termination Kit
Figure 6
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
The vent / air intake termination clearances
above the high side of an angled roof are as
shown in the following chart:
Termination Heights For Vents
above Flat or sloped roofs
Vertical
ref. nFPa 54 / ansi Z223.1
Wall
roof Pitch
Flat to 6/12
6/12 to 7/12
X 7/12 to 8/12
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
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- -
6"
combustible exterior
(152 mm)
sidewalls only, if the
SV4.5HT-2 termination
is used.
Note - See Figure 37 on Page 20 for the exterior wall recess
allowances of the square horizontal termination.
*H (ft) *H (m)
1.0 0.3
1.25 0.38
1.5 0.46
2.0 0.61
2.5 0.76
3.25 0.99
4.0 1.22
5.0 1.52
6.0 1.83
7.0 2.13
7.5 2.29
8.0 2.44
Termination Kit