Lennox EL296DFE Series Manual page 33

TYPICAL AIR INTAKE PIPE CONNECTIONS
NON−DIRECT VENT APPLICATIONS
SCREEN
(Provided)
NOTE - Air intake screen and elbow may be rotated, so that
screen may be positioned to face forward or to either side.
FIGURE 29
Follow the next two steps when installing the unit in Non-
Direct Vent applications where combustion air is taken
from indoors and flue gases are discharged outdoors.
1 - Use field-provided materials and the factory-
provided air intake screen to route the intake piping
as shown in figure 29. Maintain a minimum clearance
of 3" (76mm) around the air intake opening. The air
intake opening (with the protective screen) should
always be directed forward, or sideways.
2 - Use cement to secure the intake pipe to the
connector, if desired.
General Guidelines for Vent Terminations
In Non-Direct Vent applications, combustion air is taken
from indoors and the flue gases are discharged to the out-
doors. The EL296DFE is then classified as a non-direct
vent, Category IV gas furnace. In Direct Vent applications,
combustion air is taken from outdoors and the flue gases
are discharged to the outdoors.
AIR
INTAKE
The EL296DFE is then classified as a direct vent, Catego-
ry IV gas furnace.
In both Non-Direct Vent and Direct Vent applications, the
vent termination is limited by local building codes. In the
absence of local codes, refer to the current National Fuel
Gas Code ANSI Z223-1/NFPA 54 in U.S.A., and current
CSA-B149 Natural Gas and Propane Installation Codes in
Canada for details.
Position termination according to location given in figure
31 or 32. In addition, position termination so it is free from
any obstructions and 12" above the average snow accu-
mulation.
At vent termination, care must be taken to maintain pro-
tective coatings over building materials (prolonged expo-
sure to exhaust condensate can destroy protective coat-
ings). It is recommended that the exhaust outlet not be
located within 6 feet (1.8m) of a condensing unit because
the condensate can damage the painted coating.
NOTE - See table 19 for maximum allowed exhaust pipe
length without insulation in unconditioned space during
winter design temperatures below 32°F (0°C). If required
exhaust pipe should be insulated with 1/2" (13mm) Ar-
maflex or equivalent. In extreme cold climate areas, 3/4"
(19mm) Armaflex or equivalent may be necessary. Insu-
lation must be protected from deterioration. Armaflex with
UV protection is permissable. Basements or other en-
closed areas that are not exposed to the outdoor ambient
temperature and are above 32 degrees F (0°C) are to be
considered conditioned spaces.
Do not use screens or perforated metal in exhaust
terminations. Doing so will cause freeze-ups and
may block the terminations.
For Canadian Installations Only: In accordance
to CSA International B149 installation codes, the
minimum allowed distance between the combustion
air intake inlet and the exhaust outlet of other
appliances shall not be less than 12 inches (305mm).
Page 33
IMPORTANT
IMPORTANT