www.fmiproducts.com
56131J
16
VENTING INSTALLATION
Continued
Figure 26 - Installing Firestop
If area above is a living space, install
firestop below framed hole.
If area above is an attic, install firestop
above framed hole.
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
vertical rise of venting system and any
maximum horizontal offset limitations.
Offsets must fall within parameters shown
in Figure 25.
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.
Flat Ceiling Installation
1. Cut a 12
1
/
2
" square hole in the ceiling us
-
ing locating hole as a center point. Open-
ing should be framed to 12
1
/
2
" x 12
1
/
2
"
inside dimensions, as shown in Figure
18 on page 13, using framing lumber the
same size as ceiling joists. If area above
ceiling is an insulated ceiling or an attic,
nail firestop from top side. This prevents
loose insulation from falling into required
clearance space. If area above ceiling is a
living space, install firestop below framed
hole. The firestop should be installed with
no less than three nails per side (see
Figure 26).
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 17, page 13).
3. Cut a hole in roof using locating hole as
a center point. (Cover any exposed open
vent pipes before cutting hole in roof.) The
12
1
/
2
" x 12
1
/
2
" 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 18 on page 13.
X
12
Roof Pitch is
x 12 Listed
Clearance
8'
Minimum
Listed
Vent Cap
Lowest
Discharge
Opening
Listed
Gas
Vent
H (Min.) Height from Roof
Figure 25 - Vertical Vent Termination
Clearance
ROOF PITCH
H (Min.)
Flat to 6/12
1.0'
6/12 to 7/12
1.25'
Over 7/12 to 8/12
1.5'
Over 8/12 to 9/12
2.0'
Over 9/12 to 10/12
2.5'
Over 10/12 to 11/12
3.25'
Over 11/12 to 12/12
4.0'
Over 12/12 to 14/12
5.0'
Over 14/12 to 16/12
6.0'
Over 16/12 to 18/12
7.0'
Over 18/12 to 20/12
7.5'
Over 20/12 to 21/12
8.0'
