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Vertical Vent terMinatiOn
VENT TERMINATION ON SINGLE WALL VENT
ON SINGLE WALL VENT
SINGLE WALL TERMINATION
ROOF FLASHING
ROOF PITCHED
FROM 0" TO 45"
SHALL NOT BE A
CONCEALED SPACE
DOUBLE WALL (TYPE B-1) TERMINATION
ROOF FLASHING
ROOF PITCHED
FROM 0" TO 45"
12" MAX
SEAL JOINT BETWEEN SINGLE WALL VENT
AND "B"VENT AND THE ANNULAR SPACE OF THE "B" VENT
FIGURE 2
2.
Vent termination must be free from obstructions and at least
12" (306mm) above grade level and maximum snow height.
3.
Do not terminate vent directly below roof eaves or above
a walkway, or any other area where condensate dripping
may be troublesome and may cause some staining. Avoid
windows where steam may cause fogging or ice buildup.
4.
When horizontally vented, minimum clearance for termination
from any door, window, gravity air inlet, gas or electric
meter, regulators, and relief equipment is 4 ft. (1.2m) for U.S.
installations. Refer to NFPA 54/ANSI Z223.1 in the U.S.A. and
CSA B149.1 Natural Gas and Propane Installation Code and
.2 in Canada or with authorities having local jurisdiction. In
Canada, vent termination must have a minimum 6 ft. (1.8
m) horizontal clearance from gas and electric meters and
relief devices as specified in the Canadian B149.1, Natural Gas
Installation Code.
5.
Vent termination must be a minimum of 4' (1.2m) below or
4' (1.2m) horizontally from any soffit vent or under-eave vent.
6.
Vent must be a minimum of 6' from an inside corner formed
by two exterior walls. If possible, leave a 10' clearance.
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).
2" CLEARANCE
THIMBLE
CLEARANCE TO BE AS
SPECIFIED ON TYPE "B"
VENT PIPE
e-5
8.
When termination is routed through an exterior combustible
wall the vent must be supported using a listed clearance
thimble. Seal the connection between any single wall and/or
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 single wall
vent material installed according to the sections
Venting 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) on 50 and 80 units. In all cases, a flue
transition piece (supplied) is required to fit over the outlet of
the induced draft assembly on the appliance.
3.
Refer to table 2 for maximum vent connector lengths.
4.
Select a wall termination point that will maintain ¼1/4" rise
per foot slope of horizontal run of vent pipe. Seal single wall
Cat. III vent material according to the section A - General
recommendations and requirements.
5.
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.
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 6.
2.
The vent pipe diameter for horizontal residential installations
shall be 4" (100mm) on 50 and 80 units. A standard vent
transition is required at unit in addition to the transition
supplied with the unit.
3.
The maximum vent length is 5' (1.5m) plus one 90-degree
elbow. The minimum length is 3'(.91m).
4.
The vent must maintain a ¼1/4" rise per foot of slope
upwards toward the termination.
5.
Horizontal vent must terminate into a 4" (400mm) "T"
Category III fitting (no. 9490-Tee).
Operating Instructions and Owner's Manual
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