lp-666 Rev. 003 Rel. 001 Date 2.25.20
26
b. In the absence of specific ordinances, snow levels shall be
calculated from the average monthly maximum depth of snow
accumulation as indicated by the National Weather Service’s 10
year statistics for the installation location/geographical area.
In addition:
•
Total length of vent piping shall not exceed the limits specified
in this manual.
•
The vent piping for this direct vented appliance is approved
for zero clearance to combustible construction.
•
The flue products coming from the exhaust vent will create a
large plume when the heater is in operation. Avoid venting in
areas that will affect neighboring buildings or be considered
objectionable.
•
DO NOT locate exhaust vent or intake pipe in a parking area
where machinery may damage the pipe.
•
DO NOT vent near soffit vents, crawl space vents, or other
areas where condensate or vapor could create a nuisance or
hazard or cause property damage.
•
DO NOT vent where condensate vapor could cause damage
or could be detrimental to the operation of regulators, relief
valve, or other equipment.
In the Commonwealth of Massachusetts and as Required by
State and Local Codes:
•
The vented gas fueled appliance shall not be installed so its
combustion, ventilation, or dilution air is obtained from a
bedroom or bathroom.
•
Signage: Whenever any through-the-wall (horizontal or
sidewall) vent is installed less than seven feet above the
finished grade, a metal or plastic identification plate shall
be permanently mounted to the exterior of the building at
a minimum height of eight feet above grade directly in line
with the exhaust vent terminal. The sign shall read, in print no
less than 0.5 inches in size, “GAS VENT DIRECTLY BELOW. KEEP
CLEAR OF ALL OBSTRUCTIONS”.
•
Marking of Exhaust Vent and Intake Pipe: Piping used for
ventilation, make-up, or combustion air intake shall be labeled
as follows:
a. Throughout the entire developed length:
i. Labels must be placed every ten feet for exposed/visible
piping; or
ii. Labels must be placed every three feet for concealed
piping.
b. At all changes of direction;
c. On each side of a penetration through a partition, wall or
ceiling; and
d. The labels shall be black lettering that:
i. Indicates that the piping is used for ventilation, make-up,
or combustion air intake, and
ii. The letters shall be sized equal to a minimum of the pipe
diameter. However, for piping with a diameter exceeding
two inches, said lettering does not need to be larger than
two inches.
G. Applications
1. Direct Vent Installation of Exhaust and Intake
If installing a direct vent option, combustion air must be drawn
from the outdoors directly into the boiler intake, and exhaust must
terminate outside. There are three basic direct vent options detailed
in this manual: 1. Side Wall Venting, 2. Roof Venting, and 3. Unbalanced
Venting.
Be sure to locate the boiler such that the exhaust vent and intake
pipe can be routed through the building and properly terminated.
Different vent terminals can be used to simplify and eliminate multiple
penetrations in the building structure (see Optional Equipment in
Venting Section). The exhaust vent and intake pipe lengths, routing
and termination methods must all comply with the methods and limits
given in the Venting section of this manual.
When installing a combustion air intake from outdoors, care must be
taken to utilize uncontaminated combustion air.
NOTE:
To prevent
combustion air contamination, see Table 1.
Figure 14 - Sidewall Venting with Tee and Coupling and Optional Kit
GREATER (TYP)
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
OR GRADE, WHICHEVER IS
VENT KIT
EXHAUST
ANTICIPATED SNOW LEVEL
EXTERIOR WALL
06/23/15
LP-505-A
Sidewall Venting
with Kit
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 first 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 first three feet from the
boiler.
WARNING
!
Take extra precaution to adequately support the weight of vent
pipes terminating through the roof. Failure to properly support roof
terminated vent piping could result in property damage, serious
personal injury, or death due to flue gas leakage.
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.
NOTE:
These drawings are meant to demonstrate system venting only.
The installer is responsible for all equipment and detailing required by
local codes.
Ensure the terminations are screened to prevent blockage caused by
debris or birds.