01/04
35593 Rev G
9
CALIBER DESIGNER DIRECT VENT
3. Firestop Spacer/Vent Installation
Frame an opening and install a firestop spacer
whenever the vent penetrates a ceiling/floor area, as
shown in Figure 8. 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.
WARNING!
Be sure there are no present (nor future) obstruc-
tions to the termination cap such as trees, bushes,
snow drifts, etc.
WARNING!
Exhaust products of gasoline engines are hazard-
ous. The outside air must not be taken from a ga-
rage space, attic spaces, basements, or above the
roofing where other heating appliances, fans or
chimneys exhaust or utilize air.
4. Chase/Termination Installation
Figures 9 and 10 and Table 1 specify minimum vent
heights for various pitched roofs.
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.
Figure 10 - Multiple Vertical Termination Clearances
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
Figure 8 - Installing the Firestop Spacer
Figure 9 - Vent Height for Vertical Termination
