Astria.US.com
126640-01D
10
VENTING INSTALLATION
Continued
FIRESTOP SPACERS (FS-10, 1100EFS-10DM FOR 36" MODELS)
Figure 11 - Typical Offset Terminations
Return
Elbow
Offset
Elbow
Return
Elbow
Offset
Elbow
6' Max.
6' Max.
6' Max.
6' Max.
6' Max.
6' Max.
Return
Elbow
Offset
Elbow
Offset
Elbow
Return
Elbow
A
B
C
Offset
Elbow
Ceiling
Support Pipe
12S-12DM
Return
Elbow
Figure 12 - Firestop Spacer with Living Space Above Ceiling
Figure 13 - 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)
Existing
Ceiling
Frame
Firestop spacers are required at each point where the chimney penetrates
a floor 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 fire-
stop must be placed onto the ceiling from below as shown in Figure 12.
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 13.
Firestop Thimble FST10
Figure 13a - Firestop Thimble
IMPORTANT NOTICE
When penetrating a ceiling into an attic, a firestop
thimble (FST10) is required to avoid intrusion by insu-
lation and recommended to negotiate a joist.
