85-03-01205
ML-SERIES FIREPLACE
Page
62
Note:
Each horizontally positioned 45
º
elbow reduces the maximum horizontal distance by 1½ '.
SUPPORT:
Horizontal runs of pipe will require one vent support for every 3 ft. of pipe.
4.9.10
Minimum Rise Horizontal Termination
The ML-Series Fireplace must be installed by a qualified Mendota approved service technician.
A maximum horizontal run of 6
”
is allowed if an 18
” vertical starter section and one 90
° elbow is connected directly to this
fireplace’s flue starter
collar. The horizontal centerline of the 90
º
elbow will be 55 inches up from the floor level of this
fireplace.
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 55
inches [add ¼”
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 18
”
for Natural Gas or 24
”
for L.P. straight section to the fireplace starter adapter. Attach a 90° elbow to the top of
the 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 t o
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.
Figure 4-9 VENT CENTERLINE
