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7. Vent termination must be a minimum of 10' (3m) from any forced
air inlet (includes fresh air inlet for other appliances, such as a
dryer).
8. When termination is routed through an exterior combustible wall
the vent must be supported using a listed clearance thimble. Seal
the connection between the single wall and double wall pipes and
the annular space of the double wall pipe as shown in figure 2.
Inside edge of vent termination tee must be at least 12 inches from
outside wall as shown in figure 3.
9. For horizontal venting, the vent pipe shall be supported with
hangers no more than 3ft. (1m) apart to prevent movement after
installation.
D – HORIZONTAL VENTING – COMMERCIAL
1. Horizontal commercial installations are for buildings which are not
attached to living spaces. The vent may be stainless steel sealed
single walled cat III vent material and must be installed according to
the sections
• A - General Recommendations and Requirements, and
• C - Horizontal Venting General, and
• D - Horizontal Venting - Commercial.
Refer to figure 3.
2. The vent pipe diameter for horizontal commercial installations shall
be 4" (76mm). a transition piece has been supplied and is already
attached to your heater. Refer to figure 4
3. Select a wall termination point that will maintain 1/4" rise per foot
slope of horizontal run of vent pipe.
4. For upward sloped vent a condensate tee and drain must be
installed within the first 5' (1.5m) from the unit heater to protect
the appliance. If a flexible condensate drain line is used, the drain
line must include a loop entering the structure. If the unit is shut
down for an extended period of time and will be exposed to sub-
freezing temperatures, the condensate may freeze.
CATEGORY III VENT ACCORDING TO THESE INSTALLATION INSTRUCTIONS.
FLUE TRANSITION
(PROVIDED)
NOTE - MINIMUM HORIZONTAL LENGTH 3 FT. (1.5M)
NOT INCLUDING CAP FOR TERMINATION.
MAXIMUM HORIZONTAL LENGTH AND NUMBER OF ELBOWS
REFER TO TABLE 2.
COMMON VENTING NOT ALLOWED WHEN HORIZONTALLY VENTING THE UNIT / UTILITY HEATER
CONDENSATE DRAIN THROUGH TEE PIPE AND DRAIN LOOP
UPWARD SLOPE ON HORIZONTAL VENT-COMMERCIAL INSTALLATION
SLOPE: +¼ INCH FOR 1 FOOT RUN MINIMUM (1mm per 50mm)
Compact Unit / Utility Heater
E – HORIZONTAL VENTING – RESIDENTIAL
1. For horizontal residential installations these units are certified as
Category III appliances. Venting A - General Recommendations and
Requirements and C - Horizontal Venting General and E - Horizontal
Venting - Residential. Refer to figure 5.
2. The vent pipe diameter for horizontal residential installations shall
be 4" on all units. A transition piece has been supplied and is
already attached to your heater. Refer to figure 4
3. The maximum vent length is 25' (7.6m) plus one 90-degree elbow.
The minimum length is 5'(1.5m).
4. The vent must maintain a 1/4" rise per foot of slope (1mm per
50mm). upwards toward the termination.
Flue Transition (attached)
LISTED THIMBLE
THROUGH
COMBUSTIBLE WALL
DRAIN LOOP WITH WATER
TRAP (TO CONDENSATE DRAIN)
8
Operating Instructions and Owner's Manual
FIGURE 4
12 INCHES MIN
(30.5 CM)
EXHAUST VENT
TERMINATION TEE
12 INCHES MIN (30.5 CM)
MINIMUM ABOVE ALL
HIGHEST SNOWFALL
FIGURE 3
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