46
FV36
85-03-01014
Important Venting Configuration Notes
Note:
Prior to installing at altitudes higher than 7,500
’
, understand the gas deration requirement and adjust
burner gas orifices accordingly. If unable, please contact the Mendota technical service department for
specific venting requirements and venting restrictions.
Maximum Horizontal Run
A.
Maximum horizontal run allowed is 32
’
if a vertical starter section that is between 4
’
to 12
’
is
connected directly to this fireplace’s flue starter collar and no more than three 90
° elbows are used.
B.
Maximum horizontal run allowed
is 12” if a 9”
starter vertical section then a 90° elbow is connected
directly to this fireplace’s flue starter colla
r.
Maximum Vent System Length
A.
Combined total length of all straight pipe sections in the vent system must be less than 44
’.
B.
Combined total length of all straight pipe sections in the vent system must be less than 44
’
when
using three 90° elbows or equivalent and terminating the vent system horizontally.
C.
Combined total length of all straight pipe sections in the vent system must be less than 44
’
when
using four 90° elbows or equivalent and terminating vertically.
Using 90
°
Elbows
The fireplace allows maximum flexibility in the use of 90
°
elbows in the vent system. The length of the first
straight vertical section directly connected to the fireplace’s starter collar determines the maximum
horizontal run and the number of 90
°
elbows allowed for this fireplace.
For vent systems that provide a starting vertical section that is 4
’
to 12
’
, you may connect up to 32
’
of
horizontal pipe and up to three 90
°
elbows. For all vertical terminations, four 90
°
elbows can be used the
fourth elbow must point vertically.
Using 90
°
Elbows When the Initial Starter Vertical Section Is Less Than 4
’
For vent systems that provide a starti
ng vertical section less than 4’
the following rules apply:
a. You must use the Master Flue Venting Requirements Chart.
b. A single 90° vertical-to-horizontal elbow is already calculated into the allowable maximum horizontal run.
The Venting Requirements Chart assumes that for all horizontal runs calculated, one 90
0
elbow is used within
the venting system.
Note: Each additional 90° elbow reduces the maximum horizontal distance allowed by 3'.
c. If you plan to use more than one 90
°
elbow within the vent system, first use the Venting Requirements
Chart and calculate the maximum horizontal run you are allowed based on the first vertical section
connected directly to the fireplace. From this maximum horizontal run calculated, subtract 3
’
for each
additional 90
°
elbow you will use.
Example:
Assume you are using a 3
’
long starter vertical section. This should allow, per the Master Venting
Chart, 22 ½
’
of horizontal run. If you want to use three 90
°
elbows, subtract 6’
for two elbows
from the 22 ½
’
maximum allowed (3
’
for each elbow after the first elbow). This yields 16 ½
’
as
the maximum horizontal run that you are allowed to install using the 3
’
vertical starter section.
Caution:
If a vertical-to-horizontal discharge elbow or a horizontal-to-horizontal discharge elbow is enclosed
within a wall, floor or ceiling, a top air space clearance of 3" must be maintained above the
entire body of the elbow.
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