Mendota ML39 Assembly, Installation And Operating Instructions page 60

See, MASTER VENTING CHART and Figures, below.
Use "fixed" pipe sections in place of adjustable pipe sections
wherever possible.
Always maintain 1" clearance from vent pipe sides and bottom to
combustibles, 3" clearance on top of pipe on horizontal runs and on
top of horizontal discharge elbows. Do not fill air spaces with
insulation or other material.
Position fireplace in desired location. See guidelines on proper vent
cap placement on the exterior of home. Check to determine if wall
studs are in the way when venting system is attached. If this is the
case, you may want to adjust the fireplace location or modify the
exterior wall framing to allow the vent system to penetrate the
wall.
Measure from the floor level of the fireplace up 59
rise for every foot of horizontal run] and mark wall directly at the
center of where the vent pipe will penetrate the exterior wall.
Cut and frame a 10-3/4" wide x 10-3/4" high opening in the wall.
The hole must be positioned so the vent system will run level or
have a ¼" rise per foot of run AND be perpendicular to the wall.
The height of the opening must be located to meet all local and national building codes. Do not allow the termination to be
easily blocked or obstructed. If wall being penetrated is non-combustible material, i.e. masonry block, brick, etc., a 9-inch
diameter hole is acceptable.
Attach the 9" straight section to the fireplace starter adapter. Attach a 90° elbow to the top of the 9" vertical starter section
and rotate and lock in position. Attach a horizontal section to the 90° elbow. Be sure all vent component connections are in
their fully twist-locked position and are leak-proof.
The length of the horizontal piece that fits through the wall will be determined by the location of the fireplace relative to the
wall. For a normal installation where this fireplace is installed directly against an exterior wall constructed using 2x4 lumber or
2x6 lumber, only a 6" horizontal section is required.
There must be a minimum of 1" air space clearance to combustibles from all vent components (3" above horizontal runs and
horizontal discharge elbows).
A wall thimble must always be used when penetrating combustible wall materials.
From the exterior of the home, slide the horizontal vent cap over the end of the horizontal pipe and tightly secure the cap to
the wall with screws. Seal with a high-quality caulking.
NOTE: Combustible wall thickness must be 4" to 8" maximum
NOTE: Vent Cap should not be recessed into wall or siding.
85-03-01136
1
inches [add ¼"
2
Figure 4-16 VENT CENTERLINE
ML39 Page 60