Giant UGC55S-100 Installation & Maintenance Manual page 34

Contractors must check state and local codes before installing through an existing vent opening. State and local codes always take
precedence over manufacturer's instructions. Failure to check state and local codes before installing through an existing opening could
result in property damage and add significantly to installation costs.
CONCENTRIC VENTING THROUGH AN EXISTING SYSTEM
NOTE: The following instructions refer only to venting through an existing vent system, and not to venting with GIANT's concentric vent
kits. Refer to Concentric Vent Kit installation manual (LP-166) for further concentric venting information and instructions.
Concentric venting through an existing system must run vertically through the roof. See Table 5 for proper minimum vent sizing. Use
only the approved venting materials specified in Table 4 for piping the system. All instructions listed in Part 5 - Venting apply. See
Figures 15-1 & 15-2 for venting demonstrations.
The upper and lower vent terminations as well as all joints in the venting system must be properly sealed to ensure that all combustion
air is drawn properly and exhaust does not leak from the system. Failure to properly seal the venting system will result in property
damage, severe personal injury, or death.
NOTES:
A. For every 1" (2.5 cm) of overhang, the
exhaust vent must be located 1" (2.5 cm)
vertical below overhang (overhang means
top of building structure and not two
adjacent walls [corner of building]).
B. Typical installations require 12" (30 cm)
minimum separation between bottom of
exhaust outlet and top of air intake.
C. Maintain 12" (30 cm)
clearance above highest anticipated snow
level or grade (whichever is greater).
D. Minimum 12" (30 cm) between vents
when installing multiple vents.
E. 12" (30 cm) minimum beyond air intake.
F. Maintain 12" (30 cm)
clearance above highest anticipated snow
level or grade (whichever is greater).
Figures 15-1 & 15-2: Concentric Venting -
If an existing venting system is converted for use with this heater, the installer must ensure that the existing venting system is clean and
free from particulate contamination that could damage the heater. Failure to do so could result in property damage and heater failure.
Such failure IS NOT covered under warranty.
GI-IM048En-1013
minimum
minimum
LP
NOTE: Drawing is meant to demonstrate system venting ONLY.
LP
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