Vent Termination Clearances - Lennox Hearth Products Montebello LSM40MN-2 Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO

VENT TERMINATION CLEARANCES

These instructions should be used as a guide-
line and do not supersede local codes in any
way. Install vent according to local codes,
these instructions, the current National Fuel
Gas Code (ANSI-Z223.1) in the USA or the cur-
rent 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 4.
Terminate single vent caps relative to building
components according to Figure 5.
12"
(305mm)
Minimum
Figure 4 - Multiple Terminations
6
DV GAS FIREPLACES
®
(LSM40/45MN-2, LSM40/45MP-2, LSM40/45EN-2)
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
12
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
The vent / air intake termination clearances
above the high side of an angled roof is as
shown in the following chart:
Figure 5
horizontal Vent Termination Clearances
The horizontal vent termination must have a minimum of 3" (76 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 7. 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 Or
Unventilated Soffit
24"
(610 mm)
Termination Kit
Figure 6 - Side Elevation View
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Termination heights For Vents
Above Flat Or Sloped Roofs
Ref. NFPA 54 / ANSI Z223.1
Roof Pitch
Vertical
Flat to 6/12
Wall
6/12 to 7/12
7/12 to 8/12
8/12 to 9/12
X
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
See Figure 30 on Page 18 for the recess allowances,
into exterior walls, of the square horizontal terminations.
3"
(76 mm)
• INSTALLATION INSTRUCTIONS
* Feet * Meters
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