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118531-01C
15
VENTING INSTALLATION
Continued
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 19)
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
.
2. Set fireplace in desired location. Drop a
plumb line down from ceiling to position
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.
Figure 19 - 45° and 30° Offset with Wall
Strap
Roof
Flashing
Wall
Strap
45°
Elbows
WS-58
Wall Strap
2 - 2 x 4
Vertical
Header
OSR58-30
30° Offset
Return
Horizontal
Frame Member
Flat Ceiling Installation
1. Cut a 10
3
/
4
" square hole in the ceiling using
locating hole as a center point. Opening
should be framed to 10
3
/
4
" x 10
3
/
4
" inside
dimensions, as shown in Figure 11 on page
11, using framing lumber the same size
as the ceiling joists. If area above ceiling
is an insulated ceiling or an attic space,
you must use firestop thimble and special
firestop included with the kit from top side
to prevent insulation from contacting vent
pipe (see
Thimble Installation
, page 16). If
area above ceiling is a living space, install
firestop below framed hole. Firestop should
be installed with no less than three nails per
side (see Figure 20).
2. Assemble desired lengths of pipe and
elbows necessary to reach from fireplace
flue up through firestop. Be sure all pipe
and elbow connections are fully twist-
locked (see Figure 10, page 11).
3. Cut a hole in the roof using locating hole as
a center point. (Cover any exposed open
vent pipes before cutting hole in roof.) The
10
3
/
4
" x 10
3
/
4
" hole must be measured
on the horizontal. Actual length may be
larger depending on pitch of roof. There
must be a 1" clearance from vent pipe to
combustible materials. Frame opening as
shown in Figure 11, page 11.
4. Connect a section of pipe and extend up
through the hole.
Note:
If an offset is needed to avoid
obstructions, you must support vent pipe
every 3 feet. Use wall straps for this pur-
pose (see Figure 19). Whenever possible,
use 45° elbows instead of 90° elbows. The
45° elbow offers less restriction to the flow
of flue gases and intake air
.
Figure 20 - Installing Firestop
If area above is an attic or insulated area,
install firestop above framed hole.
If area above is an insulated area is a living
space, install firestop below framed hole.
