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Vent Installation
The vent installation must comply with all local codes and
ordinances. If in doubt, consult your local codes or inspector.
The furnace vent must be directed to the outdoors so that
harmful combustion gases will not collect inside the building.
This furnace must not be connected to a chimney flue
serving a separate solid-fuel burning appliance.
This product is design certified to ANSI Z21.86. It must be
installed with a U.L. tested and listed type "B" approved vent
and type "B/W" approved vent (Figure 8). Older style terra-
cotta, transite pipe, clay, concrete or masonry type vent pipe
cannot be used with this appliance. These types of vent
pipe will not heat fast enough to establish a draft, which
will result in improper venting of combustion products.
Consequently, this could cause the vent safety control
system to shut down the furnace.
The area above header within the stud space MUST be kept
clear of any attic insulation to allow the free circulation of
air around the oval vent piping. In some areas the building
code requires the use of an attic shield.
The B/W vent must extend through the ceiling and roof
terminating at least 12-feet above the finished floor on
which the furnace rests.
INSTALL FURNACE VENT
Attach a 4-foot length of oval, double-wall vent pipe
through the plate spacers to the hold-down plate. Push
the vent pipe into the hold-down plate until it is completely
seated. The hold-down cleat will engage the groove in the
vent pipe.
COMPLETE THE VENTING
Type B/W gas vent shall extend from the header plate of
the furnace to a point above the highest ceiling plate within
the stud space through which the vent passes, without any
offsets or crossovers. The first vent pipe offset, (if required),
may not be any closer than 2-feet from the header and
needs to extend past the ceiling plate. After a type B/W gas
vent passes through the highest ceiling plate within a stud
space above the furnace to which it serves, the vent system
may be completed with a Type B gas vent, from the SAME
manufacturer (do not mix brands of pipe). Offsets cannot
be greater than 45 degrees from vertical. Refer to The
Uniform Mechanical Code.
Install the oval-to-round adapter. Complete the piping
extending it through the roof. Use a 4-inch round, double-
wall (Type B) vent pipe, roof flashing, storm collar and vent
cap as shown. The vent cap must be at least 2-feet higher
than any point that is within 10- feet of the vent cap. There
must be at least a 1-inch clearance between the vent pipe
and any combustible material.
CAUTION: To avoid damage to wiring, be sure to route
the wires away from the path of the furnace vent.
FIGURE 8 – TYPICAL VENT INSTALLATION
VENT CAP MUST BE MINIMUM 2 FEET
HIGHER THAN ANY POINT WITHIN
10 FEET OF THE VENT CAP
HEIGHT FROM HEADER PLATE
TO THE VENT CAP TOP MUST
BE 6 FEET MINIMUM
1 INCH MIN. CLEARANCE TO COMBUSTIBLES
LISTED 4ʺ ROUND B VENT
PLATE SPACER
(RECESSED MOUNT)
2 REQUIRED
BASE PLATE (HOLD DOWN)
OR STARTER PLATE SCREWED
DOWN TO HEADER PLATE
NOTE: THESE PARTS ARE SUPPLIED WITH THE FURNACE
HEADER PLATE AND GASKETS
PROVIDED WITH FURNACE
AC2030 / AC3040 TOP VENT GAS WALL HEATER
10 FEET
OVAL TO ROUND
ADAPTER
OVAL B/W VENT
(DOUBLE WALL)
GASKET
LISTED
VENT CAP
STORM
COLLAR
ROOF
FLASHING
15
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