01/04
9
CALIBER DESIGNER SERIES
3. Install the Chase/Termination
Figure 7 and 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.
Figure 7 - Vent Height for Vertical Termination
Vent Heights
Note:
To ensure proper operation, verify all venting and
termination is unobstructed.
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
4. Check the Venting System
Check the venting system to assure proper operation.
This can be done with a match while the appliance is
operating.
Hold a lighted match at the bottom edge of the draft
hood opening. If the flames and smoke remain upright,
ventilation is acceptable. If the flames and smoke are
drawn into the draft hood, this means ventilation is
good. If the flames and smoke are forced away from
the draft hood, this may indicate a ventilation blockage
or down draft resulting in gas spillage into the home.
If this occurs, turn off the appliance and do not burn it
until it has been inspected by a qualified service
person. See Figure 8.
5. Outside Air Kit Installation
An outside air kit is supplied as an optional feature
with this appliance. An outside air kit helps to decrease
the amount of room air taken by utilizing outside air
for combustion. It is strongly recommended that it be
installed.
The outside air kit can be installed only on the left
side of the GBST, GBFL and GBCR, on the right side
of the GBCL, and on the bottom for the GBIS.
To install the outside air kit, refer to the installation
instructions provided with the kit.
Figure 8 - Testing Ventilation
Note:
The outside air kit can terminate at any level with
the exception that it must terminate at least one foot
below the vent termination cap. The outside air kit inlet
thimble should be positioned at least four feet above
the ground level in a manner that will not allow snow,
leaves, etc. to block the inlet.
Table 1
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 chim-
neys exhaust or utilize air.
