30532 Rev D
12
09-02
NASIM REAR DIRECT VENT DECORATIVE GAS APPLIANCE
c. Firestop Spacer/Chimney Installation
Frame an opening and install a firestop spacer
whenever the vent penetrates a ceiling/floor area,
as shown in Figure 18. 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 19-20, 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 18 - Installing the Firestop Spacer
Figure 19 - 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
Figure 20 - Multiple Vertical Termination Clearances
Note:
To ensure proper operation, verify all
venting and the termination are unobstructed.
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