LP-387 Rev. 011 Rel. 005 Date 1.3.19
34
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.
24.00
O
5
Intake
Exhaust
A
1
FRONT VIEW
SIDE VIEW
LP-325-PP
EXHAUST
AIR INTAKE
F
E
D
C
AIR INTAKE
B
Figure 19 - Horizontal (Snorkel) Venting
All vent pipes must be glued, properly supported, and the exhaust
pitched a minimum of 1/4” per foot back to the boiler to allow
drainage of condensate. When placing support brackets on vent
piping, the rst bracket must be within 1 foot of the boiler and the
balance of 4 foot intervals on the vent pipe. Venting must be readily
accessible for visual inspection from the rst three feet from the
boiler.
NOTE: These drawings are meant to demonstrate system venting only.
The installer is responsible for all equipment and detailing required by
local codes.
2. Venting Through an Existing System
This boiler 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 Intake Size Minimum Existing Vent / Chase Size
3” 5”
4” 7”
Table 14 - Minimum Existing Vent / Chase Sizing
Do not install the boiler into a common existing vent with any other
appliance. This will cause ue gas spillage or boiler malfunction,
resulting in substantial property damage, serious personal injury, or
death.
Figure 20 - Unbalanced Venting - Roof Exhaust and Sidewall Intake
An unbalanced vent system can be installed ONLY when the exhaust
is in the vertical position. Failure to do so could result in serious
personal injury or death.
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