Heatilator GCBC36LE Installation Instructions Manual page 7

c. Firestop Spacer/Vent Installation.
Frame an opening and install a firestop spacer when-
ever the vent penetrates a ceiling/floor area, as
shown in Figure 6. Frame the opening with the same
sized lumber as used in the ceiling/floor joists. Unless
the flue is offset, the hole should be directly above the
appliance. DO NOT pack insulation around the vent.
Assemble vent sections with three screws per joint.
Figure 6
Installing the firestop spacer
12-97
d. Chase/Termination Installation. Figure 7 a n d
Table 1 specify minimum vent heights for various
pitched roofs. Vent sections may have to be cut to a
certain length.
These vent 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 vent should down drafting
occur.
Vent Height for Vertical Termination
Roof Pitch
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
Note: To ensure proper operation, verify all
venting and the termination is unobstructed.
7i
Figure 7
H (Min.) Ft.
Table 1
Vent Height
28887A