Vent Termination Clearances - Lennox Montebello DLX Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO

VENT TERMINATION CLEARANCES

These instructions should be used as a
guideline 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 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 3.
Terminate single vent caps relative to building
components according to Figures 3 and 4.
12"
(305mm)
Minimum
Figure 3: Multiple Terminations
6
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • 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
X
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 4
Horizontal Vent Termination Clearances
The horizontal vent termination must have a minimum of 3 in. (76 mm) clearance to any
overhead combustible projection of 2 1/2 in. (64 mm) or less (see Figure 5). For projections
exceeding 2-1/2 in. (64 mm), see Figure 6 on Page 7. For additional vent location restrictions
refer to Figure 6 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
(76 mm)
24"
(610 mm)
Termination Kit
Figure 5: 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
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 28 on Page 18 for the recess allowances, into
exterior walls, of the square horizontal terminations.
3"
* 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