Mendota ML39 Assembly, Installation And Operating Instructions page 61

Vertical Rise Horizontal Termination
The minimum vertical section required to be connected directly to the starter adapter on this fireplace is 4' when used with a
maximum horizontal run of 32'. If the total length of the vertical sections connected directly to the starter adapter on this
fireplace is between 4' and 12', you are allowed a maximum 32' horizontal run. This fireplace provides a maximum flexibility in
°
the use of 90 elbows when more than 4' of vertical starter section is connected to the starter collar. If 4' or more vertical
section is connected to the starter collar, you may use three 90° elbows for horizontal terminations. For other venting
configurations within these maximum limits, see Master Venting Chart.
Combined total length of all pipe sections in the vent system should be less than 44'.
NOTE: The horizontal run of vent pipe must be level or have a ¼" rise for every 1' of run toward the
termination. Neve r allow the vent to run downward. This will cause high temperatures and the possibility
of a fire.
Follow these steps to install venting:
1. Position fireplace in desired location. Check to determine if wall studs are in the way when vent system is attached. If this is the
case you may want to adjust the fireplace location.
2. Locate where vent pipe will pass through any ceilings and will penetrate the outside wall. Since vent pipe sections "overlap,"
we suggest pre-assembling and measuring the total vent pipe run so you can more accurately locate the point where the vent
pipe will penetrate the outside wall. Be sure all vent components are properly twist locked and leak-proof. Be sure 1000°F
sealant is used in the inner pipe joints of all pipe sections manufactured by Simpson DuraVent.
3. Cut and frame a 10 ½" wide x 10 ½" high opening in the outside wall openings and 10" x 10" opening in ceiling openings. The
outside wall hole must be positioned so the vent system will have a ¼" rise per foot on horizontal runs and be perpendicular to
the wall. The height of the opening must be located to meet all building codes and not allow the termination to be easily
blocked or obstructed. A ceiling fire stop spacer is required at any floor (ceiling) opening.
4. The horizontal pipe must end flush with the exterior wall of the home. Horizontal pipe will require a proper support every 3' of
vent pipe. There must be a minimum of 1" clearance to combustibles from all vent pieces on the sides and bottom and 3"
above horizontal runs.
5. A wall thimble must always be used when penetrating combustible wall materials.
Note: Combustible wall thickness must be 4" to 8" maximum.
Note: Do not separate telescoping section. They be must be used as complete
assemblies.
6. From the exterior of the home, slide the horizontal vent cap over the end of the
horizontal pipe and tightly secure the vent cap to the wall with screws. Seal with high-
quality caulking around the outer perimeter of the vent cap.
Note: Vent cap should not be recessed into wall or siding.
85-03-01136 ML39
V(2' MIN) H1 + H2 MAX
2' 9' 11"
3' 19' 6"
4' 32'
4' – 12' 32'
For V greater than 12', see
Master Venting Chart
Vertical Rise
Three 90° Elbows
Horizontal Termination
Use the Master Venting Chart
to calculate allowable lengths.
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