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NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
VENT TERMINATION CLEARANCES
These instructions should be used as a guide-
line 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.
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 3). For projections
exceeding 2-1/2" (64 mm), see Figure 4. For
additional vent location restrictions refer to
Figure 4 on Page 7.
LENNOX HEARTH PRODUCTS • MONTEBELLO
®
POWER VENT DV GAS FIREPLACES (LSM40/45EN-PV) • INSTALLATION INSTRUCTIONS
See Figure 19 on Page 17 for the re-
cess allowances, into exterior walls,
of the power vent terminations.
Combustible Projection
2-1/2 inches or less in length
Combustible Projection
Greater than 2-1/2 inches in length
Ventilated or
Unventilated Soffit
3"
(76mm)
24"
(610mm)
Power Vent Termination
Side Elevation View
Figure 3 - Horizontal Vent Termination Clearances
Combustible
18"
(457mm)