Filter
Top Products
www.fmiproducts.com
109493-01R 9
VENTING INSTALLATION
Continued
Figure 9 - Elbow Offset
B
A
Screws
Firestop spacers are required at each point
where the chimney penetrates a oor space.
Their purpose is to establish and maintain
the required clearance between the chimney
and the combustible materials. When the pipe
passes through a framed opening into a living
space above, the restop must be placed onto
ceiling from below as shown in Figure 10.
They also provide complete separation from
one oor space to another or attic space as
required by most codes. When the double wall
pipe passes through a framed opening into an
attic space, the restop must be placed into
an attic oor as shown in Figure 11.
Figure 10 - Firestop Spacer with Living
Space Above Ceiling
Figure 11 - Firestop Spacer with Attic
Space Above Ceiling
Existing
Ceiling
Frame
Firestop
Spacer
Screws or
Staples
(Min. of 8)
Firestop
Spacer
Screws or Staples
(Min. of 8)
To maintain a 1" clearance to pipe on a roof with
a pitch, a rectangular opening must be cut.
1. Determine the center point through which
pipe will penetrate roof.
2. Determine the center point of the roof. Pitch
is the distance the roof drops over a given
span, usually 12". A 6/12 pitch means that
the roof drops 6" for each 12" one measure
horizontally down from the roof rafters.
3. Use the roof opening chart (Figure 12) to
determine the correct opening length and
ashing required.
4. Remove shingles around the opening
measured. Cut out this section.
5. Add next sections of pipe until the end
penetrates roof line. Check to see that the
proper clearances are maintained. Extend
chimney by adding sections of double
wall pipe until pipe is minimum of 30"
above the highest point of the roof cutout.
Termination and chimney must extend a
minimum of 36" above the highest point
where it passes through the roof.
19.5" Min.
30" Min.
2" Min.
2" Min.
2" Min.
Opening "A"
Slope Opening
Model No.
Flat 0° 19.5" V6F-10DM
0-6/12 26.6° 22" V6F-10DM
6/12- 12/12 45.0° 27" V12F-10DM
Existing
Ceiling
Frame
Figure 12 - Roof Opening Measurements
Determine ashing to be used with the roof
opening chart. Slide ashing over pipe until
base is at against roof. Replace as many
shingles as needed to cover exposed area
and ashing base. Secure in position by nailing
through shingles (see Figure 13, page 10). DO
NOT NAIL THROUGH FLASHING CONE.