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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 venting according to
local codes, these instructions, and the
current (USA) National Fuel Gas Code
ANSI-Z223.1 / NFPA 54, or (Canada) CAN/
CSA-B149.1 standards.
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 3).
For projections exceeding 2 1/2 in. (64 mm),
see Figure 4. For additional vent location
restrictions refer to Figure 4 and Table 5 on
Page 7.
6
POWER VENT DV GAS FIREPLACES (MDLX40/45IN-PV) • INSTALLATION INSTRUCTIONS
®
See Figure 19 on Page 17 for the re-
cess allowances, into exterior walls,
of the power vent terminations.
Side Elevation View
Figure 3: Horizontal Vent Termination Clearances
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
Combustible Projection
2 1/2 in. or less in length
Combustible Projection
Greater than 2 1/2 in. in length
Ventilated or
Unventilated Soffit
3 in.
(76 mm)
24 in.
(610 mm)
Power Vent Termination
18 in.
(457 mm)
Combustible
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