Bryan Boilers Forced Draft Steam Boilers User Manual download pdf (Page 13)

1.8.7 MARKING OF GAS VENTS

In those localities where solid and liquid fuels are

used extensively, gas vents must be plainly and

permanently identified by a label reading:

"This gas vent is for appliances which

burn gas only. Do not connect to

incinerators or solid or liquid fuel burning

appliances."

This label must be attached to the wall or ceiling

at a point near where the gas vent connector

enters the wall, ceiling or chimney.

The authority having jurisdiction must determine

whether their area constitutes such a locality.

1.8.8 VENTING MULTIPLE APPLIANCES ON A COMMON VENT

COMMON GAS VENT

When two or more openings (for vent connectors)

are provided in a chimney or gas vent, the

opening should be at different levels. They should

never be opposite one another.

When two vent connectors enter the same gas

vent or chimney, the smallest

of the two should

enter at the highest position possible.

PRESSURIZED VENTS OR VENT

CONNECTORS

DO NOT CONNECT THE FLUE OF AN

APPLIANCE VENTED BY NATURAL DRAFT TO

A VENT SYSTEM WHICH OPERATES UNDER

A POSITIVE PRESSURE.

SOLID FUEL APPLIANCE VENTS

Gas appliances must not be vented to a vent or a

chimney which serves a solid fuel burning

appliance.

1.8.9 VENT AND CHIMNEY TERMINATIONS

HEIGHT ABOVE ROOF OR OBSTACLE

WATER BOILERS AND LOW PRESSURE

STEAM BOILERS: No less than 3 feet above the

roof and no less than 2 feet above any parapet or

obstacle closer than 10 feet from the vent outlet.

HIGH PRESSURE (OVER 15 PSIG) STEAM

BOILERS: No less than 10 feet higher than any

portion of any building within a distance of 25 feet

from the vent.

MINIMUM HEIGHT ABOVE DRAFT CONTROL

Chimneys and gas vents must extend at least 5

feet above the highest connected barometric draft

control or any appliance flue outlet.

CLEARANCE FROM AIR INLETS

The vent or chimney must terminate no less than

3 feet above any forced air inlet

within a distance

of 10 feet. It must terminate no less than 1 foot

above, or 4 feet below, or 4 feet horizontally from,

any door, window or gravity air inlet into a

building.

CLEARANCE FROM PUBLIC WALKWAYS

The vent exit of a mechanical draft system must

be at least 7 feet above grade when located next

to public walkways.

PROTECTION OF BUILDING MATERIALS

FROM POSSIBLE CORROSION OR

DISCOLORATION FROM FLUE PRODUCTS

The products of combustion from gas or oil

contain potentially corrosive gases and high

temperatures. For this reason, the chimney or

vent exit must be designed to prevent exposure

of the building materials to the flue products.

Failure to do so may result in deterioration or

discoloration of building materials.

VENT SUPPORT

The gas vent or chimney must be securely

positioned and supported. Guy wires or other

reliable means must be used to prevent

movement of the vent.

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Bryan Boilers Forced Draft Steam Boilers User Manual Page 13

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