www.fmiproducts.com
125898-01D
16
VENTING INSTALLATION
Continued
Figure 16 - Offset with Wall Strap and 45°
Elbows
45° Elbow
Wall Strap
Roof Flashing
Ceiling Firestop
Installation
Note:
Vertical restrictor
must be installed in
all vertical installations.
1. Determine route your vertical venting
other framing will obstruct venting system,
cutting load bearing members.
Note: Pay
special attention to these installation
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.
plumb line down from ceiling to position
where vent will penetrate ceiling. Drill a
small locating hole at this point.
3. 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 Pitch
Flat to 6/12
1
6/12 to 7/12
1.25
Over 7/12 to 8/12
1.5
Over 8/12 to 9/12
2
Over 9/12 to 10/12
2.5
Over 10/12 to 11/12
3.25
Over 11/12 to 12/12
4
Over 12/12 to 14/12
5
Over 14/12 to 16/12
6
Over 16/12 to 18/12
7
Over 18/12 to 20/12
7.5
Over 20/12 to 21/12
8.0
1. Cut a 11
1
/
2
" square hole in ceiling using
locating hole as a center point. Opening
should be framed to 11
1
/
2
" x 11
1
/
2
" inside
dimensions, as shown in Figure 9 on page
12 using framing lumber the same size as
from top side. This prevents loose insula-
tion from falling into required clearance
space. If area above ceiling is a living
Firestop should be installed with no less
Figure 17 - Installing Firestop
If area above is a living space, install
If area above is an attic or insulated area,
