Operating instructions
18
75D0004
MLDV Series Gas Fireplace
FP1176
max 90 bends
Figure 20 -
Maximum Three (3) 90° Elbows
Per Installation
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
Max 20"
Max 20"
36"
(914 mm)
Max.
36"
(914 mm)
Max.
FP1177
max horizontal run
Figure 21 -
Maximum Horizontal Run with No Rise
FP1177
• If a 90° elbow is used in the horizontal vent run (level
height maintained) the horizontal vent length is reduced
by 36". Figure 23. This does not apply if the 90° elbows
are used to increase or redirect a vertical rise. Figure
22
According to the vent graph (Page 17) the
maximum horizontal vent length in a system with a 7.5'
vertical rise is 20’ (6 m) and if a 90° elbow is required in the
horizontal vent it must be reduced to 17' (5.2 m).
In Figures 22 and 23 dimension A plus B must not be
greater than 17' (5. m).
Figure 23 -
Maximum Vent Run with Elbows
FP1959
A + B = 17' Maximum
Horizontal 90° Elbow = 3' Reduction
7'6"
10'
7'
FP1958
Horizontal run reduction
Figure 22 -
Horizontal Run Reduction
90°
7'6"
FP1958
The horizontal vent run refers to the total length of vent
pipe from the ue collar of the replace (or the top of the
Transition Elbow) to the face of the nished outside wall
or the mounting ange of the termination.
• The maximum number of 90° elbows per side wall
installation is three (3). Figure 20
• If a 90° elbow is tted directly on the top of the replace,
the maximum horizontal vent run before the termination
or a vertical rise is 36” (914 mm). Figure 21