Superiorfireplaces.US.com
900671-00_NC
9
VENTING INSTALLATION
Continued
WARNING
Do not allow insulating materials to be blown into the
space inside the thimble and the chimney. To do so could
result in a fire hazard.
Figure 9 - Attaching Adjustable Thimble
Figure 10 - Attaching Adjustable Thimble
Open End
of Tube
Flange
End of
Tube
Thimble
Base
Placement
Holes
Pivot
Screw
section as needed to extend the thimble through the roof-line. Secure
the thimble extension to the tube section with screws no more than
1/2" in length.
Position appropriate thimble/firestop spacer combination at ceiling
and nail temporarily with two (2) 8d nails or equivalent fasteners (see
Figures 12, 13 and 14). Use one fastener on opposite sides to hold
thimble/firestop spacer combination in position. Nail permanently, us-
ing at least two (2) more fasteners, after chimney sections have been
assembled through the thimble/firestop spacer combination and after
any necessary adjustments have been made. Firestop spacer must
be secured by at least four (4) fasteners when completely installed.
Note:
If there is a room above ceiling level, firestop spacer must be installed
on the bottom side of the ceiling. If an attic is above ceiling level, firestop
thimble must be installed on the bottom side of ceiling joist (Figure 14).
Note:
The installation of the thimble extension is not required in
manufactured homes having ventilated attic spaces, when the chim-
ney height is equal to or greater than 12 feet.
Ensure the thimble penetrates the roof opening. The thimble must
extend completely through the ceiling or roof cavity to the outermost
plane of the roof.
Note:
Thimble extensions are available from your
dealer for constructions in which the distance between the outside
of the roof and the inside of the ceiling exceeds 13". The thimbles
and their extensions provide for zero clearances to combustibles
and must be used at the ceiling/roof in manufactured homes (see
Figures 13 and 14 ).
Figure 13 Pitched Roof/Bow Roof
Figure 12 Firestop Thimble
Figure 11 Firestop Spacer
Room Above
Firestop Spacer
Attic Above
1" Clearance
Minimum
Firestop Thimble
Note:
Trim Thimble/
Extension To Desired Length
And Pitch At The Rood Line
14" Min.
Pitched Roof
Pitched Roof
Bow Roof
14" Min.
Outer Pipe Of
Chimney
Outer Pipe Of
Chimney
Outer Pipe Of
Chimney
14" Min.
Thimble
FM8-AT1
13"
Thimble
Thimble
Thimble
Extension
