85-03-01136
ML39
Page
58
ML39 Master Venting Chart
Note: This chart is applicable to both natural gas and LP installations.
❑
9” minimum vertical pipe run required to be connected directly to this fireplace’s flue starter collar.
❑
Maximum horizontal run allowed w
ith the minimum 9” vertical run is 12”.
❑
Maximum vertical run allowed is 40’.
❑
Maximum vent system length allowed is 44’.
❑
32’ maximum horizontal run allowed with a minimum 4 to 12’ starter section. Three 90
°
elbows may be installed anywhere within
the 32’ horizontal run. If the starter vertical section is less than 4’, use the chart and reduce 3’ for every 90
°
elbow installed after
the first 90
°
elbow.
❑
For all vertical terminations, four 90
°
elbows allowed. However, the fourth 90
°
elbow must point vertically and directly to the
vent termination cap.
❑
Maximum Horizontal Run
❑
Maximum Horizontal Run allowed is 32 feet if a vertical starter section that is between 4 feet to 12 feet is connected
directly to this fir
eplace’s fl
ue starter collar and no more than three (3) 90-degree elbows are used.
❑
Maximum Horizontal Run allowed is 12
” if a 9” starter vertical section
is connected directly to this fireplace’s flue
starter collar.
Maximum Vent System Length
❑
Combined total length of all straight pipe sections in the vent system shall be less than 44 feet.
❑
Combined total length of all straight pipe sections in the vent system shall be less than 44 feet when using three (3) 90-
degree elbows or equivalent and terminating the vent system horizontally.
❑
Combined total length of all straight pipe sections in the vent system shall be less than 44 feet when using four (4) 90-
degree elbows or equivalent and terminating vertically.
13'-9"
18'-3"
22'-
10"
27'-5"
32'-0"
3'-
5"
12'-
11"
22'-6"
32'-0"
9"
1'-0"
2'-0"
3'-0"
4'-0"
12'-0"
16'-0"
20'-0"
24'-0"
28'-0"
32'-0"
36'-0"
40'-0"
1'-
0"
8'-0"
4'-
0"
8'-
0"
12'-0"
16'-0"
20'-0"
24'-0"
28'-0"
4'-
7"
9'-
2"
V min
H max
9
”
1
2”
12
”
3
’ 5”
2
’
1
2’ 11”
3’
2
2’ 6”
4’ –
12’
32’
12’
–
40’
Varies
Figure 4-15 MASTER VENT CHART
