7 − Vent termination must be a minimum of 6 feet (1.83
m) from an inside corner formed by two exterior
walls. If possible, leave a 10−foot clearance.
8 − Vent termination must be a minimum of 10 feet
(3m) from any forced air inlet (includes fresh air
inlet for other appliances, such as a dryer).
9 − For upward sloped vent, a condensate tee and drain
must be installed within the first 5 feet (2m) from the
duct heater to protect the appliance. If the unit is
shut down for an extended period of time and will be
exposed to sub-freezing temperatures, the
condensate may freeze.
10 − For upward sloped vent, see figure 3, condensate
tee and drain must be installed within the first 5 feet
(1.53 m) from the duct heater to protect the
appliance.
11 − Flexible loop trap in condensate line (if used)
must be filled with water to prevent combustion
products from entering structure.
12 − Select a wall termination point that will maintain
1/4" rise per foot slope of horizontal run of vent
pipe. In areas where authorities having jurisdiction
permit, a downward slope of maximum 1/4" per
foot is also acceptable. Condensate drainage can
be collected in a tee pipe section (figure 4) with
drain loop similar to one used for upward slope
vent, or allowed to drip through the vent
termination, if permitted by authorities (Fig 5).
13 For horizontal venting, the vent pipe must be
supported with hangers no more than 3 feet (1m)
apart to prevent movement after installation.
14 − All horizontal vent applications which use Category
III vent pipe must terminate with an approved
Category III tee. Opening end must face downward.
15 − When termination is routed through an exterior
combustible wall the vent must be supported
using a listed clearance thimble. Inside edge of
vent termination tee or elbow must be at least 12"
(305mm) from outside wall.
COMBUSTION AIR INDUCER CAN
BE ROTATED ON UNITS HED−75,
−100, −125 and −150 ONLY.
NOTE − FOR HED−200,
−230, −250 and 300 −− DO
NOT ROTATE THE
COMBUSTION AIR
INDUCER; USE 90° ELBOW.
NOTE − Minimum horizontal length
equals 5 feet (1.53 m).This does
not include termination tee. Refer to
table 3 for maximum length and
number of elbows.
HORIZONTAL VENTING
Venting may be single−wall (26
UPWARD SLOPE
GSG) galvanized or equivalent
stainless steel vent pipe sealed per
these instructions, OR listed special
vent for Category III appliances.
SLOPE = 1/4 IN. PER FOOT RUN
COMBUSTION
CATEGORY III
MAXIMUM.
AIR INDUCER
ADAPTER
12 INCHES MIN.
(Make airtight using
high−temperature
(30.5 CM)
sealant provided in kit)
VENT TERMINATION
TEE
LISTED WALL
THIMBLE THROUGH
12" (30.5CM)
COMBUSTIBLE WALL
MINIMUM ABOVE
HIGHEST
SNOWFALL
DRAIN LOOP WITH
WATER TRAP TO
CONDENSATE TRAP
(Provided by installer)
GROUND LEVEL
FIGURE 4
8
