Astria.us.com
125160-01_D
16
VENTING INSTALLATION
Continued
Figure 17 - Typical Offset Terminations
Return
Elbow
Elbow
Return
Elbow
Elbow
6' Max.
6' Max.
A
6' Max.
6' Max.
Return
Elbow
Elbow
Elbow
Return
Elbow
B
6' Max.
6' Max.
C
Elbow
Return
Elbow
Ceiling Support
Pipe 12S-12DM
Figure 18 - Firestop Spacer with Living Space Above Ceiling
FIRESTOP SPACERS (FS-10
)
Firestop spacers are required at each point where the chimney pen-
etrates a floor space. Their purpose is to establish and maintain the
required clearance between the chimney and the combustible mate-
rials. When the pipe passes through a framed opening into a living
space above, the firestop must be placed onto the ceiling from below
as shown in Figure 18.
They also provide complete separation from one floor 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 firestop must
be placed into an attic floor as shown in Figure 19.
Figure 19 - Firestop Spacer with Attic Above Ceiling
Screws or Staples
(Min. of 8)
Firestop
Spacer
Existing
Ceiling Frame
PENETRATING ROOF
To maintain a 2” clearance to the pipe on a roof with a pitch, a rect-
angular opening must be cut.
1. Determine center point through which pipe will penetrate roof.
2. Determine center point of roof. Pitch is distance the roof drops
over a given span, usually 12”. A 6/12 pitch means that roof
drops 6” for each 12” measured horizontally down from roof
rafters.
3. Use roof opening chart (Figure 20) to determine correct
opening length and flashing required.
4. Remove shingles around opening measured. Cut out this
section.
5. Add next sections of pipe until end penetrates roof line. Check
to see that proper clearances are maintained. Extend chimney
by adding sections of double wall pipe until pipe is minimum
of 30” above highest point of roof cutout. Termination and
chimney must extend a minimum of 36” above highest point
where it passes through roof.
Existing
Ceiling Frame
Screws or Staples
(Min. of 8)
Firestop Spacer
Pitch
Slope
Opening "A" Max.
Used Flashing
Model No.
Flat
0°
19.5
"
(496 mm)
V6F-10DM
0-6/12
26.6°
22
"
(559 mm)
V6F-10DM
6/12-12/12
45.0°
27
"
(686 mm)
V12F-10DM
30
"
(762 mm)
Min.
Opening
"
A
"
19-
1
/
2
"
(496 mm)
2
"
(51 mm)
Min
2
"
(51 mm)
Min
2
"
(51 mm)
Min
Figure 20 - Roof Opening Measurements
