Operating Instructions and Owner’s Manual
Compact Unit Heater
E-5
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
Installation Code.
VENT TERMINATION ON SINGLE WALL VENT
SINGLE WALL TERMINATION
DOUBLE WALL (TYPE B-1) TERMINATION
ROOF FLASHING
ROOF PITCHED
FROM 0” TO 45”
SHALL NOT BE A
CONCEALED SPACE
2” CLEARANCE
THIMBLE
ROOF FLASHING
ROOF PITCHED
FROM 0” TO 45”
12” MAX
CLEARANCE TO BE AS
SPECIFIED ON TYPE “B”
VENT PIPE
SEAL JOINT BETWEEN SINGLE WALL VENT
AND “B”VENT AND THE ANNULAR SPACE OF THE “B” VENT
FIGURE 2
5. Vent termination must be a minimum of 4’ (1.2m) below or
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).
8. When termination is routed through an exterior combustible
wall the vent must be supported using a listed clearance
thimble. Where local authorities permit, a single section
of type B-1 vent pipe may be used as an alternative to the
thimble. When using a type B-1 vent termination use the
clearances specified by the vent manufacturer. Seal the
connection between the single wall and double wall pipes
and the annular space of the double wall pipe as shown in
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.
3. Refer to
table 2
for maximum vent connector lengths.
4. Select a wall termination point that will maintain ¼” rise
per foot slope of horizontal run of vent pipe. The vent
may be single wall material minimum 26 GSG (0.46mm)
galvanized steel or equivalent grade stainless steel. Seal
single wall 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 I appliances. The vent may be single
wall material minimum 25 GSG (0.46mm) galvanized steel
or equivalent grade stainless steel.
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 45 units. A standard vent transition is
required at unit in addition to the transition supplied with the
unit.
The vent pipe diameter for horizontal commercial installations
shall be 4” (76mm) on 45 units. In all cases, a flue transition
piece (supplied) is required to fit over the outlet of the
induced draft assembly on the appliance.
