LOCATION GUIDELINES FOR
HORIZONTAL DIRECT VENTS
IMPORTANT: MOISTURE IN THE
COMBUSTION PRODUCTS
CONDENSES AS IT LEAVES THE
TERMINATION. THIS CONDEN-
SATE CAN FREEZE ON EXTERIOR
WALLS, UNDER THE EAVES, AND
ON SURROUNDING OBJECTS.
SOME DISCOLORATION TO THE
EXTERIOR IS TO BE EXPECTED.
HOWEVER, IMPROPER LOCATION
OR INSTALLATION CAN CAUSE
STRUCTURAL OR EXTERIOR
FINISH DAMAGE TO THE
BUILDING AND MAY RECIRCU-
LATE PRODUCTS OF COMBUS-
TION INTO THE COMBUSTION AIR
TERMINAL AND FREEZE IT
CLOSED.
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FIGURE 44
DIRECT VENT MINIMUM CLEARANCES
NOTE: In Canada terminate the vent
according to the current CAN/CGA-
B 149 Gas Installation Code and/or
local codes.
The direct vent system must be
installed with the following minimum
clearances. See Figures 44 and 45.
1 . The bottom of the vent terminal
and the air inlet shall be located
at least 12 inches above grade.
Increase the 12 inch minimum to
keep the terminal openings
above any snow accumulation,
where applicable.
2. The vent shall not terminate
over public walkways or over an
area where condensate or vapor
could create a nuisance or
hazard.
INSIDE
CORNER
AS REQUIRED 4
GASOR 0- AS •
ELECTRIC
V- -.cEQUIRE
1
METER
44
FIGURE 45
MOISTURE ZONES
VENT---. ,··w..--
COMBUSTION AIR I U"
PIPE 4"
CI::] 12·
..._______. CAULK
INSIDE
CORNER
6'
&'CAULK
r- ZONE
1
~-
~
-l--,."1"""1' -,-,---~,----
---4• __ ....,
2 FT. SQ. SHEET METAL PLATE ON
BRICK OR MASONRY SURFACE
RECOMMENDED BUT NOT
REOUIRED BY
CODE.
3. The vent terminal shall be
located at least one foot from
any opening through which flue
gases could enter a building.
4. The vent terminal shall be at
least 3 feet above any forced air
inlet located within 10 feet,
except the combustion air inlet
of a direct vent appliance.
5.
►
Locate the vent terminal a
sufficient distance horizontally to
prevent the flue gases from
affecting the operation of any
electric meter, gas meter,
regulator, or relief equipment.
6.
►
Locate the air inlet a sufficient
distance from the vent of any
other gas or fuel burning appli-
ance, or electric clothes dryer, to
prevent those flue gasses from
affecting furnace operation. The
only exception to this require-
ment is the case of multiventing
two or more furnaces, which is
covered in the section on multi-
venting in these instructions.
In addition to the minimum
clearances listed above, the vent
location should also be governed by
the following guidelines.
1. Do not terminate under any
kind of patio or deck. If
running the vent under a
deck, insulate it to insure no
condensate freezes and
blocks the pipe.
2. Do not locate on the side of a
building with prevailing winter
winds. This prevents moisture
from freezing on walls and
under eaves.
3. Do not extend vent directly
through brick or masonry
surfaces. When penetrating
brick or masonry, use a rust
resistant sheet metal or plastic
backing plate between the vent
pipe and brick or masonry.
4. Do not locate the vent too close
to shrubs as condensate may
stunt or kill them.
5. Minimum vertical clearances
of 1 foot are recommended
for overhangs up to 1 foot
horizontal. The vertical
clearance should be increased
equally for each additional
increase in horizontal overhang
to a maximum vertical clearance
of
6 feet.
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