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Through-the Wall Vent Termination (Category III)
The product uses the positive pressure generated by the burner system blower to push combustion products out of the
vent. Vent materials may be a stainless steel suitable for exposure to condensate or shall be of the insulated type.
The vent system must be certified for use with an appliance requiring a Category III, pressurized vent system. Seal all
joints and support horizontal lengths of vent as required by the vent manufacturer.
The sidewall vent length varies by unit size:
Sidewall vents on models 400, 540, 750 and 1000 may be up to Thirty Equivalent Feet (30') in length, plus the vent
terminal. Sidewall vents on models 1200, 1600 and 2000 may be up to Fifty Equivalent Feet (50') in length, plus the
vent terminal.
Pipe fittings reduce the maximum allowable sidewall vent length. See the "Vent Pipe Fitting Equivalent" table for each
fitting installed in the sidewall vent.
Vent Pipe Size
90º Elbow
90º Long Radius Elbow
45º Elbow
Do not use a barometric damper when sidewall venting.
The vent cap should terminate at least 3 feet (0.91 m) above any forced air inlet within 10 feet (3.05 m); 4 feet (1.22 m)
below, 4 feet (1.22 m) horizontally from or 1 foot (0.3 m) above any door, window or gravity air inlet to the building; 1
foot (0.3 m) above grade; 1 foot (0.3m) above normal snow levels and shall terminate at least 7 feet (2.13 m) above
grade when located adjacent to public walkways or gathering areas.
The vent terminal should not be installed closer than 3 feet (0.91 m) from an inside corner of an L-shaped structure.
CONVENTIONAL VENTING
Vertical and Horizontal Remote Air
A vertical or horizontal remote air inlet system requires installation of an optional "Combustion Air Inlet Package" to
duct combustion air from outdoors directly to the unit. The maximum length of field supplied single wall pipe, in
equivalent feet is specified in the "Remote Combustion Air Inlet Package" table below.
Important: Each unit must have a dedicated remote combustion air duct. Combining multiple-unit remote air ducts into
a common remote combustion air duct is not recommended.
The combustion air cap supplied with the optional remote combustion air inlet package MUST be used to adequately
protect the combustion air inlet from wind and weather.
When the remote combustion air inlet and flue gas outlet are located on the same roof top surface, the cap must
terminate at least 3 feet (0.91 m) lower than the flue gas outlet, if located within a 10 foot (3.05 m) radius.
For horizontal remote combustion air inlet only, locate the inlet in a wall with wind pressure similar to the wind pressure
on the vent. Install the inlet cap at least one foot (0.3 m) above the rooftop or at least 18" above grade and at least
one foot (0.3 m) above normal snow levels.
VENT PIPE FITTINGS EQUIVALENT (in feet)
6"
11 feet
6 feet
5 feet
7
8"
10"
14 feet
18 feet
8 feet
12 feet
7 feet
9 feet
THROUGH THE WALL VENTING
12"
21 feet
14 feet
10 feet
34-50 04/02/2010
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