Lennox Merit Plus Series Installation Instructions

19
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
LENNOX HEARTH PRODUCTS • MERIT PLUS
®
DIRECT VENT GAS FIREPLACES (MPDP35/40) • INSTALLATION INSTRUCTIONS
TABLE C
H
+H
1
Maximum H Maximum V Minimum
feet feet feet
5
(1.524)
2
(0.610)
1
(0.305)
10
(3.048)
4
(1.219)
2
(0.610)
15
(4.572)
6
(1.829)
3
(0.914)
20
(6.096)
8
(2.438)
4
(1.219)
V + V
1
+ H + H
1
= 40 feet (12.2 m) Max
H = 8 feet (2.438 meters) Max.
H + H
1
= 20 feet (6.096 meters) Max.
(meters)
(meters)
(meters)
This table shows a 1 (V) to 5 (H) ratio. For every 1 foot of (V) verti-
cal, you are allowed 5 feet of (H) horizontal run, up to a maximum
horizontal run of 20 feet.
Example: If 20 feet of (H) horizontal vent run is needed, then 4
feet minimum of (V) vertical vent will be required.
Note: Install the U-shaped vent restrictor in any vent run with
more than 8 ft. of vertical rise. See Pages 13 and 14.
Example: If 20 feet of (H) horizontal vent run is needed, then 4 feet minimum
of (V) vertical vent will be required.
An elbow is acceptable as 1 foot of vertical rise.
Note:
• An elbow may NOT be attached directly to the vent collar.
• Install the U-shaped vent restrictor in any vent run with more than 8 ft.
of vertical rise. See Pages 13 and 14.
VERTICAL VENT FIGURES/TABLES
(continued)
Figure 37: Rear Vent - THREE ELBOWS
Figure 38: Top Vent - THREE ELBOWS
H1
V
V1
H
Ceiling
Firestop/Spacer
SV4.5VF*
Wall
Firestop/Spacer
SV4.5HF**
*When using Secure Flex
®
, use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
Ceiling
Firestop/Spacer
SV4.5VF*
V
H
1
H
V
1
Ceiling
Firestop/Spacer
SV4.5VF*
Wall
Firestop/Spacer
SV4.5HF**
*When using Secure Flex, use
Ceiling Firestop/Spacer SF4.5VF.
**When using Secure Flex, use
Wall Firestop/Spacer SF4.5HF.
V
H
Ceiling
Firestop/Spacer
SV4.5VF*
*When using Secure Flex, use
Ceiling Firestop/Spacer SF4.5VF.
TABLE D
H +
H
1
Maximum
V Minimum
feet feet
5
(1.524) Elbow Only
5
(1.524)
1
(0.305)
10
(3.048)
2
(0.610)
15
(4.572)
3
(0.914)
20
(6.096)
4
(1.219)
H + H
1
= 20 feet (6.096 m) Max.
V + V
1
+ H + H
1
= 40 ft. (12.192 m) Max.
(meters) (meters)
3
4
5
2
0.914
1.219
0.524
0.610
TABLE D
H +
H
1
Maximum
V Minimum
feet feet
5
(1.524) Elbow Only
5
(1.524)
1
(0.305)
10
(3.048)
2
(0.610)
15
(4.572)
3
(0.914)
20
(6.096)
4
(1.219)
H + H
1
= 20 feet (6.096 m) Max.
V + V
1
+ H + H
1
= 40 ft. (12.192 m) Max.
(meters) (meters)
Min. 1 ft. vent
section required
V
H
1
H
V
1
Ceiling
Firestop/Spacer
SV4.5VF*
Wall
Firestop/Spacer
SV4.5HF**
*
When using Secure Flex, use
Ceiling Firestop/Spacer
SF4.5VF.
**
When using Secure Flex, use
Wall Firestop/Spacer
SF4.5HF.

Lennox Merit Plus Series Specifications

General

Brand	Lennox
Model	Merit Plus Series
Category	Indoor Fireplace
Language	English