HTP EL-399 - Manual (Page 38)

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LP- 293 REV. 5.20.14
Do not install the boiler into a common existing vent with any other appliance. This will cause flue gas spillage or boiler malfunction,
resulting in substantial property damage, severe 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 significantly to installation costs.
1. 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 concentric vent
kits (2” Part # KGVAT0501CVT, 3" Part # KGAVT0601CVT). Refer to Concentric Vent Kit installation manual (Part # LP-166) for further
concentric venting information and instructions.
Concentric venting through an existing system must run vertically through the roof. See Table 13 for proper minimum vent sizing. Use
only the approved venting materials specified in Table 9 for piping the system. All instructions listed in Part 5 - Venting, Sections A
– G
apply. See Figures 18-1 and 18-2 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” of
overhang, the exhaust
vent must be located
1” vertical below
overhang (overhang
means top of building
structure and not two
adjacent walls [corner
of building]).
B. Typical installations
require 12” minimum
separation between
bottom of exhaust
outlet and top of air
intake.
C. Maintain 12”
minimum clearance
above highest
anticipated snow level
or grade (whichever is
greater).
D. Minimum 12”
between vents when
installing multiple
vents.
E. 12” minimum
beyond air intake.
F. Maintain 12”
minimum clearance
above highest
anticipated snow level
or grade (whichever is
greater).
Figure 18 – 1, 18 – 2 Concentric Venting NOTE: Drawing is meant to demonstrate system venting ONLY.