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21
VENT INSTALLATION
HORIZONTAL (THROUGH THE WALL) TERMINATION CONFIGURATIONS
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 vari-
ous dimensions allowable.
See page 18.
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 siding.
It is best to locate the fireplace in such a way that minimizes the number of offsets and horizontal vent length.
The horizontal vent run refers to the total length of vent pipe from the flue collar of the fireplace (or the top of the Transition
Elbow) to the face of the outer wall.
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 specifically mentioned should be ignored when calculating
venting layouts.
W
ARNING
Figure 24 - Maximum Three (3) 90° Elbows
Per Installation
• The maximum number of 90° elbows per side wall installation is three (3).
See Figure 24.
• If a 90° elbow is fitted directly on top of the fireplace flange the maximum horizontal vent run before the termination or
a vertical rise is 36” (914 mm).
See Figure 25.
Figure 25 - Maximum Horizontal Run with No Rise
3 x 90°
Elbows
3 x 90°
Elbows
36"
Max.
36"
Max.
