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Elevated Vertical Rise Through-The-Wall Venting
The required MINIMUM vertical rise is 48 in. when used with a maximum horizontal run of 12 ft. For other venting configurations
within these maximum limits.
NOTE: All horizontal runs 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 90º vertical-to-horizontal elbow is already calculated into the allowable maximum 12'
horizontal run. Each additional 90º elbow reduces the maximum horizontal distance by 3'. Example: by using three total 90º
elbows the maximum horizontal distance has been reduced to 6 ft. (3 - 1 = 2 elbows x 3' = 6'; 12' Max. - 6' of elbows = 6' of
horizontal run). Note: 45º elbows reduce the maximum horizontal distance by 1½ '.
SUPPORT: Horizontal runs of pipe will require one vent support for every 3 ft. of pipe.
CAUTION: If a vertical-to-horizontal elbow is enclosed within a wall, floor or ceiling, a top air space clearance of 2" must be
maintained above the elbow. Be sure to maintain 1" air space to any combustibles on the sides and bottom, 2" above horizontal
pipe sections.
THIS FIREPLACE MUST BE INSTALLED BY A QUALIFIED MENDOTA APPROVED SERVICEPERSON.
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 the 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 Be sure all vent components are properly twist locked and leak-
proof.
3.
Cut and frame a 9-1/2" wide x 10" high openings in the outside wall openings and 9" x 9" opening in 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 building codes and not allow the termination to be easily blocked or
obstructed. A ceiling fire stop spacer is required at all floor (ceiling) penetrations.
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 pipes will require proper support every 3
ft. of vent pipe. THERE MUST BE A MINIMUM OF 1" CLEARANCE TO COMBUSTIBLES ON THE SIDES AND
BOTTOM OF ALL VENT PIECES (2" above horizontal runs and above elbows).
6.
A wall thimble must always be used when penetrating combustible wall materials.
NOTE: Combustible wall thickness must be 4" to 8" maximum for the wall thimble. Wall more than 8" thick will require special
protection. Contact Mendota Technical services for assistance.
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.
WARNING: Venting terminal shall never be recessed into wall cladding or siding. Vent Cap must sit on top of siding or cladding.
85-03-01113
DXV35DT4
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