29
7077-801F • 08/20
E. Pellet Venting Charts
The maximum horizontal venting allowed with no vertical
venting attached is 48 inches (1219mm) including one
90° elbow or two 45° elbows. This is our recommended
horizontal venting installation. Addition of any horizontal
venting beyond 48 inches (1219mm) requires a minimum
60 inches (1524mm) of additional vertical vent. Horizontal
sections of vent pipe should have a 1/4 inch (6.35mm) rise
per foot.
GHP recommends any installation requiring more than two
90° elbows, or more than 15 feet (4.5m) of venting to use 4
inch (102mm) vent.
One 90° Elbow
Total
Horizontal
Minimum
Vertical
Vent
Diameter
4
0
3
5
5
3
6
6
3
7
7
3
8
8
4
9
9
4
10
10
4
11
11
4
12
12
4
13
13
4
14
14
4
15
15
4
16
16
4
17
17
4
18
18
4
19
19
4
Two 90° Elbow
Total
Horizontal
Minimum
Vertical
Vent
Diameter
2
5
3
3
6
3
4
7
3
5
8
3
6
9
3
7
10
4
8
11
4
9
12
4
10
13
4
11
14
4
12
15
4
13
16
4
14
17
4
15
18
4
Three 90° Elbow
Total
Horizontal
Minimum
Vertical
Vent
Diameter
2
11
4
3
12
4
4
13
4
5
14
4
6
15
4
7
16
4
8
17
4
9
18
4
10
19
4
11
20
4
45° elbow is equivalent to
1 foot of straight pipe.
90° elbow is equivalent to
3 feet of straight pipe.
WARNING
!
Fire Risk.
• Only LISTED venting components may be
used.
• NO OTHER vent components may be used.
Substitute or damaged vent components may
impair safe operation.
Minimum Vertical Vent for One Elbow
0
5
10
15
20
0
5
10
15
20
Horizontal Run, (ft)
M
in
im
um
V
er
tica
l R
ise
(ft
)
Horizontal Run (FT)
Minimum Vertical Vent for One Elbow
Minimum Vertical Vent for Three Elbows
0
5
10
15
20
25
0
2
4
6
8
10
12
Length of Horizontal Sections (ft)
M
in
im
um
V
er
tica
l R
ise
(ft
)
Minimum Vertical Vent for Three Elbows
Length of Horizontal Sections (FT)
Minimum Vertical Vent for Two Elbows
0
5
10
15
20
0
5
10
15
Length of Horizontal Sections, (ft)
M
in
im
um
V
er
tica
l
R
ise
, (ft
)
Minimum Vertical Vent for Two Elbows
Length of Horizontal Sections (FT)
Minimum Vertical Vent for One Elbow
0
5
10
15
20
0
5
10
15
20
Horizontal Run, (ft)
M
in
im
um
V
er
tica
l R
ise
(ft
)
Horizontal Run (FT)
Minimum Vertical Vent for One Elbow
Minimum Vertical Vent for Three Elbows
0
5
10
15
20
25
0
2
4
6
8
10
12
Length of Horizontal Sections (ft)
M
in
im
um
V
er
tica
l R
ise
(ft
)
Minimum Vertical Vent for Three Elbows
Length of Horizontal Sections (FT)
Minimum Vertical Vent for Two Elbows
0
5
10
15
20
0
5
10
15
Length of Horizontal Sections, (ft)
M
in
im
um
V
er
tica
l
R
ise
, (ft
)
Minimum Vertical Vent for Two Elbows
Length of Horizontal Sections (FT)
Minimum Vertical Vent for One Elbow
0
5
10
15
20
0
5
10
15
20
Horizontal Run, (ft)
M
in
im
um
V
er
tica
l R
ise
(ft
)
Horizontal Run (FT)
Minimum Vertical Vent for One Elbow
Minimum Vertical Vent for Three Elbows
0
5
10
15
20
25
0
2
4
6
8
10
12
Length of Horizontal Sections (ft)
M
in
im
um
V
er
tica
l R
ise
(ft
)
Minimum Vertical Vent for Three Elbows
Length of Horizontal Sections (FT)
Minimum Vertical Vent for Two Elbows
0
5
10
15
20
0
5
10
15
Length of Horizontal Sections, (ft)
M
in
im
um
V
er
tica
l
R
ise
, (ft
)
Minimum Vertical Vent for Two Elbows
Length of Horizontal Sections (FT)
NOTICE:
These are guidelines for successful venting of your pellet appliance. The more vertical rise you can obtain in your
system, the better it will perform. Horizontal vent runs can accumulate ash and will need to be cleaned more often. Try to
keep them as short as possible.
