Mendota DXV-45 DT4 Installation & Operating Instructions Manual page 22

A-2 ELEVATED RISE THROUGH-THE-WALL VENTING FOR NG AND LPG
The minimum vertical rise from top of fireplace is 48 in. when used with the maximum horizontal run of 16 ft. For other
venting configurations within these maximum limits see pg. 17.
NOTE: All horizontal runs of vent pipes must 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.
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USING OFFSETS AND RETURNS: A single 90 vertical-to-horizontal elbow is already calculated into the
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allowable maximum 16' horizontal run. Each additional 90 elbow reduces the maximum horizontal distance by 3'. A max-
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imum of two 90° or four 45° elbows, in addition to the first 90 elbow, can be used (total equivalent of three (3) 90 elbows
in entire vent system. 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: Be sure to maintain 1" air space clearances to any combustibles around all pipe sections that are vertical. Be
sure to maintain 1" air space clearances to any combustibles on the sides and below all horizontal pipe sections and el-
bows and 2" from the top of all horizontal pipes and fittings.
IMPORTANT: REFER TO DRAWINGS ON PAGE 17 & 18 WHILE FOLLOWING THESE INSTRUCTIONS.
Position fireplace in desired location. For guidelines on proper vent cap placement on exterior of home. Check to deter-
mine if wall studs are in the way when vent system is attached. If this is the case you may need to adjust the fireplace lo-
cation.
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. Be sure all vent components are properly twist locked and leak-proof.
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Be sure 1000 silicate sealant (Millpak #65-06-00909) is used in the inner joints of all pipe sections (Dura Vent only).
*NOTE: DO NOT SEPARATE TELESCOPING SECTIONS USE AS COMPLETE ASSEMBLIES.
Cut and frame a 10-3/4" x 10-3/4" opening in the outside wall and in any ceiling openings. The outside wall hole must be
positioned so the vent system will have a ¼ " rise per foot of run AND be perpendicular to the wall. The height of the open-
ing must be located to meet all local and national building codes and not allow the termination to be easily blocked or ob-
structed. A ceiling fire stop spacer is required at any floor (ceiling) opening.
Connect a 90° elbow to the fireplace adapter on top of fireplace vent outlet.
Always use a Wall Thimble (#45-01-00229) when penetrating a combustible wall.
The horizontal pipe must end flush with the exterior wall of the home. Horizontal pipe will require a proper support (part
#45-01-00234) every 3 ft. of vent pipe. THERE MUST BE A MINIMUM OF 1" CLEARANCE TO COMBUSTIBLES FROM
ALL VENT PIECES (2" above horizontal runs). 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.
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