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NOTE

: Thermal resistance values for typical chimneys are as

follows:

R2 (2 ft

•

•°

F / Btu):

Clay-lined masonry, "A" vent

R3 (3 ft

•

•°

F / Btu):

Metal liner in clay-lined masonry

R6 (6 ft

•

•°

F / Btu): Metal or clay-lined masonry with R4.5

(4.5 ft

•

•°

F / Btu) insulation between

liner and masonry (e.g. 2" of expanded
mica or 1

⅜

" of high density glass

fibreboard.)

Applying Table 2

If a furnace with a 0.60 USGPH nozzle is to be connected to a 6.1 m
(20') tall clay-lined masonry chimney, the thermal resistance of this
chimney type is R2, therefore, inferior to R6. The actual firing rate at
156 psig is 1.25 x 0.60 = 0.75. Therefore this table shall apply as
follows:
The minimum permitted inside diameter shall be 4";
The maximum permitted inside diameter shall be 5";
The minimum base temperature shall be about 160°C (320°F).

The vent should not end:

a)  Directly above a sidewalk or mutual driveway;
b)  Less than 2.1 m (7') above a paved driveway;
c)  Less than 1.8 m (6') from a door, window or opening that

supplies air to the building;

d) Above a gas meter or regulator or less than 0.9 m (3') from the

centre of the regulator;

e) Less than 1.8 m (6') from any gas regulator vent exits or less

than 0.9 m (3') from an oil tank vent or oil fill inlet;

Less than 0.3 m (1') above ground level or less than 1.8 m (6')
from a combustion air inlet;

g)  Less than 1.8 m (6') from a property line;
h)  Under a veranda, porch or patio;
i)  With the combustion gas being directed toward combustible

material or openings of a nearby building less than 1.8 m (6')
away;

Less than 0.9 m (3') from the interior corner of an "L" shaped
structure;

With the opening of the vent located less than 0.3 m (1') from any
surface that supports ice, snow or debris.

1.5)

AIR FOR COMBUSTION

WARNING

Poisonous carbon monoxide gas hazard.

Comply with ANSI/NFPA (in the U.S.A.) or CSA (in
Canada) standards for the installation of Oil
Burning Equipment and applicable provisions of
local building codes to provide combustion and
ventilation air.

Failure to provide adequate combustion and
ventilation air can result in death and/or personal
injury.

1.5.1) General

Oil furnaces must have an adequate supply of combustion air. It is
common practice to assume that older homes have sufficient
infiltration to accommodate the combustion air requirement for the
furnace. However, home improvements such as new windows,

doors,

and weather stripping have drastically reduced the volume of air
infiltration into the home.

Home air exhausters are common. Bathroom and kitchen fans, power
vented clothes dryers, and water heaters all tend to create negative
pressure in the home. Should this occur, the chimney becomes less
and less effective and can easily downdraft.

Heat Recovery Ventilation (HRV) systems are gaining in popularity.
HRVs are not designed to supply combustion air. If not properly
balanced, a serious negative pressure condition could develop in the
dwelling.

1.5.2) Contaminated Combustion Air

Installation in certain areas or types of structures will increase the
exposure to chemicals or halogens which may harm the furnace.
These instances will require that only outside air be used for
combustion.

The following areas or types of structures may contain or have
exposure to the substances listed below. The installation must be
carefully evaluated, as it may be necessary to provide outside air for
combustion.
a. Commercial

buildings;

Buildings with indoor pools;

Furnaces installed near chemical storage areas.

TABLE 2

Total input rating of all

connected appliances

Inside diameter of flue

Minimum base temperature for chimney height

BTU/h

USGPH

Min.

Max.