lp-505 Rev. 000 Rel. 015 Date 1.7.20
32
2. Venting Through an Existing System
This heater may be vented through an existing unused vent system.
The inner diameter of the existing vent system is utilized for the
combustion air source. Two methods have been approved for such
venting: Concentric Venting Through an Existing System and Venting
as a Chase.
Vent / Air Inlet Size Minimum Existing Vent / Chase Size
2” 4”
3” 5”
4” 7”
Table 19 - Minimum Existing Vent / Chase Sizing
Do not install the heater into a common existing vent with any other
appliance. This will cause ue gas spillage or heater malfunction,
resulting in substantial property damage, serious personal injury, or
death.
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 signicantly to installation costs.
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.
Concentric Venting Through an Existing System
NOTE: The following instructions refer only to venting through an
existing vent system, and not to venting with HTP’s optional concentric
vent kits. Refer to Concentric Vent Kit installation manual (LP-166) for
further information on venting with the optional concentric vent kits.
Concentric venting through an existing system must run vertically
through the roof. See Table 19 for proper minimum vent sizing. Use
only the approved venting materials specied in Table 14 for piping
the system. All instructions listed in this Venting section apply. See
Figures 25-1 and 25-2 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, serious personal injury, or death.
Chase Venting Through an Existing System
When venting as a chase, follow all instructions included in this
Venting section, including those in the previous Concentric Venting
Through an Existing System section. See Figure 25-3 for chase
venting demonstration.
SEAL
SEALED
EXISTING
EXHAUST
CAP
(w/SCREEN)
SEAL
AIR INTAKE
SEAL
LP-325-LL
03/15/12
Exhaust
Intake
Concentric Venting through an Existing System
1
12" MIN.
LP-325-MM
03/15/12
EXHAUST
SEAL
w/SCREEN
EXISTING
AIR INTAKE
SEALED CAP
COMBUSTION AIR
COMBUSTION
AIR
SEAL
Concentric Venting through an Existing System
2
Intake
Exhaust
Exhaust
Intake
07/22/13
LP-325-NN
INTAKE
EXHAUST
24"
SEAL
EXISTING
VENT
CAP
SEAL
Exhaust
Intake
Chase Venting through an Existing System
3
Figure 25 - 1, 2 - Concentric Venting Through an Existing System, 3, Chase Venting Through an Existing System
NOTE: These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required
by local codes.
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