Smith Cast Iron Boilers JWF307 Air Requirements, Air Supply, Ducted Furnace Room And/or room

VENT

DRAFT

RISE 20mm/m

REGULATOR

(1/4 in./ft.)

FILL CAP

SERVICE

BLOCKED VENT

SWITCH

SAFETY SWITCH

LEVEL

GAUGE

T&P VALVE

OIL

AQUASTAT

OPERATING

STORAGE

INSTRUCTIONS

TANK

CUT OFF VALVE

OIL FILTER

OIL

BURNER

Figure 4

Installation Diagram

Air Requirements

Houses built in accordance with the “National Building

An adequate supply of combustion and ventilation air is

Code of Canada, 1985” (or subsequent edition), with

required to:

extensive exterior stucco coating, or with a sealed vapour

• Ensure proper combustion.

barrier or other similar air sealing technique, will often be

• Reduce risk of property damage, severe bodily injury or

sufficiently airtight so that there is not sufficient air for both

combustion and venting the products of combustion of an

death from possible flue gas leakage and carbon monox-

oil-fired appliance, or for replacing the air vented by other

ide emissions.

exhaust devices within the house.

Do not install an exhaust fan in the same room as the water

heater.

Outdoor Combustion & Ventilation Air

Satisfactory combustion cannot be sustained in an area that

(Unconfined space)

is not provided with fresh air. Fresh air contains oxygen that

If the water heater is installed in an unconfined space in a

is necessary for proper combustion. If the water heater is

building having insufficient infiltration, additional air for com-

installed in a confined space, sufficient fresh air must be

bustion and ventilation shall be obtained from outdoors or

drawn in from outside of the enclosure.

from spaces freely communicating with the outdoors. Under

NOTE: Lack of adequate fresh air supply may cause a

these conditions, permanent opening(s) shall be provided

poor flame.

so that the total air received through these openings will be

Air Supply

at least as much as would be admitted by openings having

a total free area of 4.5 cm2/kWh (1 in2/5000 Btu/h) of the

total input rating of all oil-fired appliances.

CAUTION

Outdoor Combustion & Ventilation Air (Confined

If an all-house ventilation fan is used, a sep-

arate outside

air duct

must

be used and

space)

ducted

to the

furnace

room

and/or room

A heater installed in a confined space that obtains all of its

air for combustion and ventilation from outside the building

where the water heater is located.

shall be provided with two permanent openings, one near

In Canada:

the top of the enclosure and another near the bottom. Each

opening shall communicate directly or by means of ducts

If the water heater is installed in a house built to the require-

with the outdoors or to such spaces (such as a crawl space)

ments of the “National Building Code of Canada, 1985”,

that freely communicate with the

outdoors, and shall be

or a subsequent edition, the space shall be provided with air

sized in accordance with “Air Duct Sizing”.

inlets as outlined below, or have a mechanical air-supply

system of sufficient equivalent capacity. If a mechanical air-

Outdoor Combustion Air & Indoor Ventilation

supply system is used, it shall be interlocked to the appli-

Air (Confined space)

ance or equipment.

An appliance located in a confined space that obtains its

NOTE: In unconfined spaces in buildings of conventional

combustion air from outdoors and ventilation air from within

frame, brick, or stone construction built prior to the require-

the conditioned space of the building shall be provided with

ments of the “National Building Code of Canada, 1985”,

two permanent openings for ventilation. One located near

and not subsequently significantly air-tightened, infiltration is

the top of the enclosure and another near the bottom. Each

normally adequate to provide air for combustion and some

opening

shall have a free area

of not less than 19.5

ventilation;

however, there may be notable exceptions.

cm2/kWh (1 in2/1000 Btu/h) of the total input rating of all

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