16
A-1
MINIMUM RISE THROUGH-THE-WALL VENTING
:
The minimum vertical rise for vent installation through the wall is 16 1/4" from the top of the fireplace to the
centerline of the 90
º
elbow in installations where only a 6” (or 7”) horizontal vent section is used (refer to chart
on pg.14 when using horizontal sections). NOTE: We recommend always using the most vertical rise the in-
stallation will allow. This maximizes efficiency and flame appearance. This is especially true for LP gas instal-
lations and for installations at higher altitudes. Use "fixed" pipe sections in place of adjustable pipe sections
wherever possible. 1000
º
sealant must be used on ALL inner pipe joints. Always maintain 1" clearances from
vent pipe to combustibles, 2" above pipe on horizontal runs. Do not fill air spaces with insulation or other ma-
terial.
For
L.P. gas and High Altitude (above 4,000 ft.),
45
º
elbows must be used in place of 90
º
elbows.
NOTE: This requires 19" minimum rough opening depth (see pg. 15 CAUTION: If 90
º
elbows must be used,
a 3-foot vertical starter section must be used directly off the top of the fireplace.
The DXV-35 Fireplace must be installed by a qualified Mendota approved service person.
1.
Position fireplace in desired location. See pg. 8 for 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.
2.
Measure from the top of the fireplace up minimum (see Figure 4: Specifications & Clearances, pg. 12) and
mark wall directly at the center of where the vent pipe will penetrate the wall.
3.
Cut and frame a 9" wide x 10" high opening in the wall. The hole must be positioned so the vent system
will run level or have a ¼" rise AND be perpendicular to the wall. The height of the opening must be locat-
ed to meet all local and national building codes and not allow the termination to be easily blocked or ob-
structed. If wall being penetrated is non-combustible material, i.e. masonry block, brick, etc., a 7-inch
diameter hole is acceptable.
4.
Assemble the components to the fireplace adapter with pipe seams oriented toward the wall or floor -- as
much out of view as possible. Be sure all vent component connections are in their fully twist-locked posi-
tion and are leak-proof. Be sure 1000
º
sealant is used on the inner pipe joints of all pipe sections manufac-
tured by Simpson DuraVent. American Metal pipe joints do not required this sealant.
5.
The length of the horizontal piece that fits through the wall will be determined by the thickness of the wall.
When installed, the end of the horizontal piece must be flush with the exterior wall of the home. There
MUST be a minimum of 1" air space 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 cap to the wall with screws. Seal with a high quality caulking.
NOTE: Venting terminal should not be recessed into wall or siding.
IMPORTANT: REFER TO DRAWINGS ON PAGES1215 WHILE FOLLOWING THESE INSTRUCTIONS
.
NOTE: DO NOT SEPARATE TELESCOPING SECTIONS.
THEY MUST BE USED AS COMPLETE ASSEMBLIES.
