Mendota DXV-42 Installation & Operating Instructions Manual page 16

A-2 ELEVATED RISE THROUGH-THE-WALL VENTING
A maximum horizontal run of 12 ft. is allowed if a minimum vertical rise of 48" is used. Consult Figure 6,
pg. 12 for maximum horizontal runs allowed when using vertical rises less than 48".
NOTE: The horizontal run of vent pipe must be level or have a ¼" rise for every 1' of run toward the
termination. Never allow the vent to run downward. This will cause high temperatures and the
possibility of a fire.
USING OFFSETS AND RETURNS:
A single 90
º
horizontal run. Each additional 90
NOTE: 45º elbows reduce the maximum horizontal distance by 1½ '. Always maintain the proper rise (6'
for each elbow used after the initial elbow) for the calculated total run when using elbows.
SUPPORT: Horizontal runs of pipe will require one vent support for every 3 ft. of pipe.
CAUTION: Be sure to maintain 1" air space clearances to any combustibles (2" above horizontal runs).
The DXV-42 Fireplace must be installed by a qualified Mendota service person.
1. Position fireplace in desired location. See pg. 8 for guidelines on proper vent cap placement on exterior
of home. 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 position 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. (See Exte-
rior Vent Locations, pg.8). Be sure all vent components are properly twist locked and leak-proof. Be
sure 2000 sealant is used in the inner joints of all DuraVent pipe sections
º
*NOTE: DO NOT SEPARATE TELESCOPING SECTIONS USE AS COMPLETE ASSEMBLIES.
3. Cut and frame a 9" x 10" opening in the outside wall and in any ceiling openings. The outside wall
hole must be positioned so the vent system will run level or have a ¼ " on rise AND be perpendicular to
the wall. The height of the opening must be located to meet all local and national building codes and
not allow the termination to be easily blocked or obstructed. A ceiling firestop spacer is required at any
floor (ceiling) opening.
4. Connect vent pipe to the fireplace adapter on top of fireplace vent outlet.
5. The horizontal pipe must end flush with the exterior wall of the home. Horizontal pipe will require a
proper support every 3 ft. of vent pipe. THERE MUST BE A MINIMUM OF 1" CLEARANCE TO
COMBUSTIBLES FROM ALL VENT PIECES (2" above horizontal runs).
6. A wall thimble must always be used when penetrating combustible wall materials.
NOTE: Combustible wall thickness must be 4" to 8" maximum
7. 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.
NOTE: Venting terminal should not be recessed into the wall or siding.
vertical-to-horizontal elbow is already calculated into the allowable maximum 12'
elbow reduces the maximum horizontal distance by 3'.
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1
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