Horizontal Vent Tables And Figures - Lennox Montebello MDLX40IN Installation Instructions Manual
Direct vent gas fireplaces
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- Care and operation instructions manual (24 pages) ,
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- Care and operation instructions manual (24 pages)
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LENNOX HEARTH PRODUCTS • MONTEBELLO
See Table 9 as an aid in venting component selection for a particular
range of exterior wall thicknesses.
Venting Components Required for Various Exterior
Wall Thicknesses, when using Square Termination Kit
(SV8HTS - see Figure 28)
Vent Components Required
Termination Kit Only
Termination Kit and 6" Vent
Section (SV8L6)
Termination Kit and Tele-
scopic Section (SV8LA)
Termination Kit and Tele-
scopic Section (SV8LA) and
6" vent section (SV8L6)
Table 9
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
®
Exterior Wall Thickness - inches (mm)
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 45º elbows may be used in place of one 90º elbow. The same rise
to run ratios, as shown in the venting figures for 90º elbows, must be
followed if 45º 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" 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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