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venting with Two 90° Elbows
vertical (v) Horizontal (H)
5' Min.
2' Max.
6' Min.
3' Max.
7' Min.
4' Max.
8' Min.
5' Max.
12' Min.
8' Max.
20' Min.
8' Max.
Figure 25 - Horizontal Termination Configuration for Venting Using Three 90° Elbows
INSTALLATION FOR vERTICAL
TERMINATION
Note: Vertical restrictor must be installed in
all vertical installations.
1. Determine the route your vertical venting
will take. If ceiling joists, roof rafters or
other framing will obstruct the venting
system, consider an offset (see Figure 26)
to avoid cutting load bearing members.
Note: Pay special attention to these instal-
lation instructions for required clearances
(air space) to combustibles when passing
through ceilings, walls, roofs, enclosures,
attic rafters, etc. Do not pack air spaces
with insulation. Also note maximum verti-
cal rise of the venting system and any
maximum horizontal offset limitations.
(v)CD36T Series Only: When installing
the OSR58-30 offset, it must be turned
20° off center line (see Figure 27, page
18). This will give you the 1" clearance
to horizontal framing members that are a
minimum of 12" above fireplace.
2. Set fireplace in desired location. Drop a
plumb line down from ceiling to position
116035-01J
VENTING INSTALLATION
Continued
Horizontal (H)+
Horizontal (H
)
2
6' Max
8' Max
10' Max
12' Max
20' Max
20' Max
90°
Elbow
(Model (V)CD36T)
Wall
Strap
www.desatech.com
90°
Elbow
of fireplace exit flue. Mark center point
where vent will penetrate ceiling. Drill a
small locating hole at this point.
Drop a plumb line from inside of roof to
locating hole in ceiling. Mark center point
where vent will penetrate roof. Drill a small
locating hole at this point.
Roof Flashing
1.5"
(38 mm)
WS-58
Wall Strap
1" (25 mm)
OSR58-30
30° Offset
Return
45°
2 - 2 x 4
Elbows
Vertical
Header
Figure 26 - 45° and 30° Offset with Wall
Strap
90°
Elbow
Horizontal
Frame Member
12"
(305
mm)
17
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