10
31282 Rev Q
09/04
CALIBER B-VENT INSTALLATION INSTRUCTIONS
4. Chase/Termination Installation
Figure 8 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.
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
Note:
To ensure proper operation, verify all vent-
ing and the termination is unobstructed.
Figure 8
Vent Height for Vertical Termination
Figure 9
Testing Ventilation
5. Check the Venting System
Check the venting system to assure proper operation.
This can be done with a match while the appliance is
operating. See Figure 9.
Hold a lighted match at the bottom edge of the draft
hood opening.
a.
If the flames and smoke remain upright,
ventilation is acceptable.
b.
If the flames and smoke are drawn into the draft
hood, this means ventilation is good.
c.
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.
Table 1
a.
b.
c.
f i r e - p a r t s . c o m
