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LENNOX HEARTH PRODUCTS • MONTEBELLO
See Table 8 as an aid in venting component selection for a particular
range of exterior wall thicknesses.
Vent Components Required Exterior Wall Thickness—inches (mm)
Termination Kit Only
Termination Kit and 6 In. Vent
Section (SV8L6)
Termination Kit and Tele-
scopic Section (SV8LA)
Termination Kit and Tele-
scopic Section (SV8LA) and
6 in. vent section (SV8L6)
Table 9: Venting Components Required for Various Exterior
Wall Thicknesses, when using Square Termination Kit
(SV8HTS—see Figure 28)
Table C
H Maximum
feet
(meter)
feet
3.5
(1.07)
2.5
6.5
(1.98)
3.5
8.5
(2.6)
4.5
10.5
(3.2)
5.5
12.5
(3.8)
6.5
14.5
(4.4)
7.5
16.5
(5.0)
8.5
18.5
(5.6)
9.5
20
(6.0)
10
V + H = 40 feet (12.4 m) Max.
H = 20 ft. (6.2 m) Max.
Square termination (SV8HTS) shown.
See Table 9 as an aid in venting component selection for
a particular range of exterior wall thicknesses.
Figure 29:
Top Vent—One 90 Degree Elbow (Elbow Connection Not Directly at Appliance
DLX DIRECT VENT GAS FIREPLACES (MDLX40/45) • INSTALLATION INSTRUCTIONS
®
5 to 8-1/2 (127 to 216)
9-3/4 to 14 (248 to 356)
6-3/4 to 15-1/4 (171 to 387)
11-1/4 to 19-3/4 (286 to 502)
Example: If 20 feet of (H)
horizontal vent run is needed,
then 10 feet minimum of (V)
V Minimum
vertical vent will be required.
(meter)
(0.762)
(1.07)
(1.37)
(1.68)
(1.98)
(2.3)
(2.6)
(2.9)
(3.0)
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
HORIZONTAL VENT FIGURES/TABLES
Notes:
• Secure Vent
components (rigid vent pipe and terminal) are shown
®
in the Figures.
• Two 45 degree elbows may be used in place of one 90 degree elbow.
The same rise to run ratios, as shown in the venting figures for 90
elbows, must be followed if 45 degree elbows are used.
• SV8BF (Secure Vent) firestop/spacer must be used anytime vent pipe
passes through a combustible floor or ceiling. SV8HF (Secure Vent)
firestop/spacer must be used anytime vent pipe passes through a
combustible wall.
• It is very important that the horizontal/inclined run be maintained in a
straight (no dips), slightly elevated plane. The recommended incline
is approximately 1/4 in. per foot (20 mm per meter) horizontal, in a
direction away from the fireplace. The rise per foot run ratios that
are smaller are acceptable all the way down to at or near level.
H
Wall Firestop/Spacer
(SV8HF)
)
V
19
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