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33606 Rev D 12 01-03
BUILDER'S CHOICE SERIES INSTALLATION INSTRUCTIONS
c. Firestop Spacer/Chimney Installation
Frame an opening and install an FS6 Firestop
Spacer whenever the vent penetrates a ceiling/
floor area, as shown in Figure 16. Frame the
opening with the same sized lumber as used in
the ceiling/floor joists. Do not pack insulation
around the chimney.
d. Chase/Termination Installation
Figures 17 and 18, and Table 1 specify minimum
chimney heights for various pitched roofs.
These chimney heights are necessary for safety
and do not ensure draft-free operation. Trees,
buildings, adjoining roof lines, adverse conditions,
etc. may create a need for a taller chimney should
down drafting occur.
Figure 16
Installing the Firestop Spacer
Figure 17
Chimney Height for Vertical Termination
Roof Pitch H (Min.) Ft.
Flat to 6/12 1.0
6/12 to 7/12 1.25
Over 7/12 to 8/12 1.5
Over 8/12 to 9/12 2.0
Over 9/12 to 10/12 2.5
Over 10/12 to 11/12 3.25
Over 11/12 to 12/12 4.0
Over 12/12 to 14/12 5.0
Over 14/12 to 16/12 6.0
Over 16/12 to 18/12 7.0
Over 18/12 to 20/12 7.5
Over 20/12 to 21/12 8.0
Table 1
Chimney Height
Note: To ensure proper operation, verify all venting and
the termination are unobstructed.
Figure 18
Multiple Vertical Termination Clearances