Lennox ENVY Installation Instructions Manual page 20

LENNOX HEARTH PRODUCTS • SIGNATURE
Horizontal Vent Tables and Figures
NOTE: Secure Vent components (rigid vent
®
pipe and terminal) are shown in the figures;
Secure Flex components (flexible vent pipe
®
and terminal) may also be used.
NOTE: Two 45° elbows may be used in place
of one 90° elbow. The same rise to run ratios,
as shown in the venting figures for 90° elbows,
must be followed if 45° elbows are used.
NOTE: 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. Rise per foot run ratios are
acceptable to at or near level.
NOTE: SV4.5VF (Secure Vent), SF4.5VF
(Secure Flex) firestop/spacer must be
used anytime vent pipe passes through
a combustible floor or ceiling. SV4.5HF
(Secure Vent), SF4.5HF (Secure Flex)
firestop/spacer must be used anytime vent
pipe passes through a combustible wall.
NOTE: The tables show a 1(V) to 1.6 (H) f i r e - p a r t s . c o m
ratio up to a maximum horizontal run of
16 ft.
NOTE: An elbow is acceptable as 1 ft of
vertical rise, but may not be connected
directly to the appliance collar.
WARNING
Under no circumstances,
may separate sections of
concentric flexible vent pipe be
joined together.
Table 18: Venting Components Required
for Various Exterior Wall Thicknesses,
when using Typical Termination Kits
Vent Components
Exterior Wall Thickness
Required
Termination Kit Only
Termination Kit and 6 in.
Vent Section (SV4.5L6)
Termination Kit and 12 in.
Vent Section (SV4.5L12)
Termination Kit and
Telescopic Section
(SV4.5L12)
20
SERIES DIRECT-VENT GAS FIREPLACES • ENVY/ENVY CD 35/40/45 • INSTALLATION INSTRUCTIONS
®
Table 19: Top Vent—One 90° Elbow, Elbow Connection NOT at Appliance
V + H = 60 ft (18.3 m) maximum
H = 16 ft (4.87 m) maximum
Install the U-shaped vent restrictor in any vent run with more than 6 ft of vertical rise. See Page 12 for more
information.
Square termination (SV4.5HT-2) shown.
If 16 ft of (H) horizontal vent run is needed, then 10 ft minimum of (V) vertical vent will be required.
This table shows a 1 (V) to 1.6 (H) ratio. For every 1 ft of (V) vertical, you are allowed 1.6 ft of (H) horizontal run, up to
a maximum horizontal run of 16 ft (4.87 m).
6–9 1/4 in.
(152–235 mm)
10 3/4–14 in.
(2733–356 mm)
16 3/4–20 in.
(426–508 mm)
11 3/4–20 in.
(299–508 mm)
DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
When using Secure Flex,
use Firestop/Spacer
SF4.5VF.
When using Secure Flex,
use Firestop/Spacer
SF4.5HF.
Wall Firestop/Spacer
H Maximum
feet meters
3 0.91
5.2 1.58
6.8 2.07
8.4 2.56
10 3.05
16 4.87
H
Min. One
Foot Vent
Section
Required
(SV4.5HF)
Ceiling
Firestop/Spacer
(SV4.5VF)
V Minimum
feet
1.6
3
4
5
6
10
V
meters
0.490
0.914
1.22
1.524
1.729
3.050