Lennox Bella Installation And Operation Manual page 15

Determining Size Of Pipe To Install
To determine what diameter pipe to use in an installation (3" or 4"), first
find the "equivalent pipe length" using the following guidelines, then plot
this number and the altitude on the chart (Figure 19).
Fill out the installation chart, and calculate your total equivalent pipe
length. After you have the total equivalent pipe length, use the Pipe
Selection Chart (Figure 19) to determine if your installation requires 3"
or 4" exhaust pipe.
Installation Chart
Type of Pipe # of Elbows or
Feet of pipe
90° Elbows/
Tee (A & G)
45° Elbows
(C)
Horizontal
(B & F)
Vertical (E)
Table 1
Sample Installation Chart
Type of Pipe # of Elbows or
Feet of pipe
90° Elbows/ 
Tee (A & G)
45° Elbows 1
(C)
Horizontal 3
(B & F)
Vertical (E) 8
Table 2
- Sample Chart for Figure 20
Equivalent Feet Total Equivalent
Feet
x 5 Feet (1.5 m)
x 3 Feet (1 m)
x 1 Feet (.3 m)
x .5 Feet (.15 m)
Equivalent Feet Total Equivalent
Feet
x 5 Feet (1.5 m) 10 (3 m)
x 3 Feet (1 m) 3 (1 m)
x 1 Feet (.3 m) 3 (1 m)
x .5 Feet (.15 m) 4 (1. m)
Total Equivalent Feet = 0
NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE
30
0
3 or 4"
Diameter
10
0
0 1 3
 4
Altitude x 1000 Feet
Figure 19
- Pipe Selection Chart
NOTE: All equivalent pipe styles
shown for model Bella™ pellet stove.
A - 90 Degree Elbow
B - 1' Horizontal Pipe
C - 45 Degree Elbow
D - Standoff Braces
E - 8' Vertical Pipe
F - ' Horizontal Pipe
G - 90 Degree Tee
H - Wall Thimble
Figure 20
- See Sample Installation Chart
4 " Diameter Only
5 6 7 8 9 10
B
A
C
D
E
F
G
H
15