Vertical Vent Tables And Figures - Lennox Hearth Products Montebello LSM40MN-2 Installation Instructions Manual

LENNOX HEARTH PRODUCTS • MONTEBELLO
VERTICAL VENT FIGURES/TABLES
Notes:
• Secure Vent™ (rigid vent pipe) is shown
in the Figures.
• It is very important that the horizontal/
inclined run be maintained in a straight (no
dips) and recommended to be in a slightly
elevated plane, in a direction away from the
fireplace of 1/4" rise per foot (20 mm per
meter) which is ideal, though rise per foot
run ratios that are smaller are acceptable all
the way down to at or near level.
• 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.
• 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.
Ceiling
Firestop/Spacer
(SV8BF)
A Vent Restrictor, as shown in Figure 15 on
Page 12, may need to be used in this application
Figure 25
- Top Vent - STRAIGhT
16
DV GAS FIREPLACES
®
Figure 26
TWO 90 dEGREE ELBOWS
40 feet (12.2 meters)
Maximum
6 feet (1.8 meters)
Minimum
Figure 27 - Top Vent - ThREE ELBOWS
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
(LSM40/45MN-2, LSM40/45MP-2, LSM40/45EN-2)
H
Ceiling
Firestop/Spacer
(SV8BF)
V1
- Top Vent - Corner Framing with Square Termination (SV8hTS)
V 1
H 1
Table B
h + h 1 Maximum
feet (meter) feet
10 (3.1) 2.5
15 (4.65) 3.5
20 (6.2) 4.5
h + h 1 = 20 feet (6.2 m) Max.
V + V 1 + h + h 1 = 40 ft. (12.4 m) Max.
V + V 1 = 11 feet (3.3 meters) Min. for LSM40-2
V + V 1 = 10.5 feet (3.2 meters) Min. for LSM45-2
• INSTALLATION INSTRUCTIONS
Table A
h Maximum
feet (meter)
10 (3.1)
15 (4.65)
20 (6.2)
V + V + h = 40 feet (12.4 meters) Max.
1
V + V = 11 feet (3.3 meters) Minimum for LSM40-2
1
V + V = 10.5 feet (3.2 meters) Minimum for LSM45-2
1
Example: If 20 feet of (H)
horizontal vent run is needed,
V
then 4-1/2 feet minimum of (V)
vertical vent will be required.
Ceiling
Firestop/Spacer
Wall
(SV8BF)
Firestop/Spacer
(SV8HF)
H
V Minimum
(meter)
(0.762)
(1.06)
(1.37)
Example: If 20 feet of (H+ H
tal vent run is needed, then 4-1/2 feet
minimum of (V) vertical vent will be
required.
V Minimum
feet (meter)
2.5 (0.762)
3.5 (1.07)
4.5 (1.37)
V
) horizon-
1