Figure 18 - Maximum Three (3) 90
degree
Elbows
Per Installation
Figure 19 - Maximum Horizontal Run with No Rise
3 x 90
°
Elbows
20"
Max.
VENT INSTALLATION
HORIZONTAL TERMINATION CONFIGURATIONS — RIGID VENTING
Since it is very important that the venting system maintain its balance between the combustion air intake and the flue gas
exhaust, certain limitations as to vent configurations apply and must be strictly adhered to.
The Vent Graph, showing the relationship between vertical and horizontal side wall venting, will help to determine the various
dimensions allowable.
See page 16.
Minimum clearance between vent pipes and combustible materials is 3" on top and 1" from bottom and sides unless
otherwise noted.
When vent termination exits through foundations less than 20" below siding outcrop, the vent pipe must flush up with the sid-
ing.
It is best to locate the fireplace in such a way that minimizes the number of offsets and horizontal vent length.
18
19
The horizontal vent run refers to the total length of vent pipe from the flue collar of the fireplace (or the top of the
90 degree
Starting e
lbow) to the face of the outer wall.
WARNING
•
The maximum number of 90° elbows per side wall installation is three (3).
See Figure 18.
When installing the appliance as a
horizontally
vent
ed
unit,
a
9
0
°
starting
elbow attached
directly to
the rear of the unit is NOT INCLUDED in the following criteria and calculations,
and unless
specifically mentioned should be ignored when calculating venting layouts
