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5. COMBUSTION AIR

If the furnace is installed in a closet or utility room, two
openings must be provided connecting to a well-
ventilated space (full basement, living room or other
room opening thereto, but not a bedroom or
bathroom). One opening shall be located above the
level of the upper vent opening and one opening below
the combustion air inlet opening in the front of the
furnace. Each opening shall have a minimum free area
of 1½ square inches per 1,000 Btu/h of total input
rating of all appliances installed in the room.

For furnaces located in buildings of unusually tight
construction, such as those with high quality weather
stripping, caulking, windows and doors, or storm
sashed windows, or where basement windows are well
sealed, a permanent opening communicating with a
well ventilated attic or with the outdoors shall be
provided, using a duct if necessary. The duct opening
shall have a free area of 1½ square inches per 1,000
Btu/h of total input rating of all appliances to be
installed. When a furnace is installed in a full
basement, infiltration is normally adequate to provide
air for combustion and draft operation. Furnace rooms
under 65m³ (700 ft³) should automatically be treated as
confined space.

6. CHIMNEY VENTING

The flue pipe should be as short as possible with
horizontal pipes sloping upward toward the chimney at
a rate of one-quarter inch to the foot. The flue pipe
should not be smaller in cross sectional area than the
flue collar on the furnace. The flue pipe should connect
to the chimney such that the flue pipe extends into,
and terminates flush with the inside surface of the
chimney liner. Seal the joint between the pipe and the
lining. The chimney outlet should be at least two feet
above the highest point of a peaked roof. All unused
chimney openings should be closed. Chimneys must
conform to local, provincial or state codes, or in the
absence of local regulations, to the requirements of the
National Building Code.

NOTE: THE FURNACE IS APPROVED FOR
USE WITH TYPE L VENT OR EQUIVALENT.

CHIMNEY VENTED VERSIONS OF THE
FURNACE MUST BE CONNECTED TO A
FLUE HAVING SUFFICIENT DRAFT AT ALL
TIMES TO ENSURE SAFE AND PROPER
OPERATION OF THE APPLIANCE.

NOTE: THE RECOMMENDED OVER-FIRE
DRAFT PRESSURE IS -0.02 IN. W.C. (SEE FIG.
1).

The flue pipe must not pass through any floor or
ceiling, but may pass through a wall where suitable fire
protection provisions have been installed. Refer to the
latest edition of CAN/CSA B-139 for rules governing
the installation of oil burning equipment. In the United
States, refer to the latest edition of NFPA 31 for
regulations governing the installation of oil burning
equipment.

See appendix A for burner set-up.

Fig. 1: Checking Over-Fire Draft.

7. BAROMETRIC DAMPER CONTROL.

The barometric damper control, also known as a draft
regulator, is used on conventional chimney venting
only. This control automatically maintains a constant
negative pressure in the furnace to obtain maximum
efficiency. It ensures that proper pressures are not
exceeded. If the chimney does not develop sufficient
draft, the draft control cannot function properly. The
draft regulator, when installed should be in the same
room or enclosure as the furnace and should not
interfere with the combustion air supplied to the
burner. The control should also be located near the
furnace flue outlet and installed according to the
instructions supplied with the regulator. The flue outlet
pressure (measured between the furnace and draft
regulator, or the oil burner mounting plate over-fired
draft access port. Fig 1) should be set to -0.02 in. w.c.