20306748
17
MLDV Series Gas Fireplace
VENTING INSTALLATION
Figure 20 -
Maximum Three (3) 90° Elbows
Per Installation
3 x 90°
Elbows
3 x 90°
Elbows
FP1176
36"
(914 mm)
Max.
36"
(914 mm)
Max.
Figure 21 -
Maximum Horizontal Run with No Rise
FP1177
W
ARNING
When installing the appliance as a rear
vent unit, the 90° or 45° transition elbow
attached directly to the rear of the unit is
NOT INCLUDED in the following criteria
and calculations and, unless speci
fi
cally
mentioned, should be ignored when
calculating venting layouts.
•
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
Example:
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' (5.2 m).
Figure 23 -
Maximum Vent Run with Elbows
A + B = 17' Maximum
Horizontal 90° Elbow = 3' Reduction
7'6"
10'
7'
A
B
Figure 22 -
Horizontal Run Reduction
90°
7'6"
A
B
FP1958
The horizontal vent run refers to the total length of vent
pipe from the
fl
ue collar of the
fi
replace (or the top of the
Transition Elbow) to the face of the
fi
nished outside wall
or the mounting
fl
ange of the termination.
•
The maximum number of 90° elbows per side wall
installation is three (3).
Figure 20
•
If a 90° elbow is
fi
tted directly on the top of the
fi
replace,
the maximum horizontal vent run before the termination
or a vertical rise is 36” (914 mm).
Figure 21
