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1.8.7 ACCEPTABLE VENT TYPES
LISTED GAS VENTS
Listed gas vents must be applied only on those
applications for which they are listed. Type B gas
vents are NOT listed for use on forced draft
appliance vent systems.
Installation of these vents must comply with the
vent listing, with the vent manufacturer's
instructions and with complete adherence to the
codes and clearances as outlined previously.
PRESSURIZED VENT SYSTEMS
Some Bryan Boilers (unless specifically fitted for
the application) are not suitable for operation on a
pressurized vent systems. Refer to Section 2 of
this manual for the allowable range of vent
pressure for each series. The RV, RW, and AB
series boilers are designed for pressurized vent
systems. All others require a neutral pressure.
SINGLE-WALL METAL PIPE
Single-wall metal pipe must be of galvanized
sheet or other approved non-combustible
corrosion resistant material, with minimum
thickness per Table 1.8.7, from the National Fuel
Gas Code. Single-wall metal pipe should be
insulated to prevent excessive heat in the boiler
room and to avoid ignition and spillage problems
as well as corrosion from excessive
condensation.
MASONRY, METAL AND FACTORY BUILT
CHIMNEYS
Installation of factory built vents and chimneys
must comply with the vent listing, with the vent
manufacturer's instructions and with adherence to
the codes and clearances as outlined herein.
Masonry or metal chimneys must be built and
installed in accordance with nationally recognized
building codes or standards.
MASONRY CHIMNEYS FOR RESIDENTIAL
APPLICATIONS MUST BE LINED WITH FIRE-
CLAY FLUE LINING (KX C315 OR THE
EQUIVALENT) WITH THICKNESS NOT LESS
THAN 5/16 INCH OR WITH A LINER OF OTHER
APPROVED MATERIAL THAT WILL RESIST
CORROSION, SOFTENING OR CRACKING
FROM FLUE GASES AT TEMPERATURES UP
TO 1800F.
EXISTING CHIMNEYS SHOULD BE
INSPECTED FOR UNSAFE CONDITIONS,
SUCH AS DETERIORATED MASONRY AND
EXCESSIVE SOOT OR OTHER BLOCKAGE OR
POTENTIAL BLOCKAGE. SEE ALSO SECTION
1.8.6.
EXISTING CHIMNEYS MUST BE PROPERLY
SIZED FOR THE FLUE GAS LOADING TO BE
USED. THAT IS, IF AN EXISTING CHIMNEY IS
USED FOR A SMALLER TOTAL INPUT THAN
ITS ORIGINAL DESIGN, A LINER OR VENT IS
REQUIRED. THE USE OF A PROPERLY SIZED
GAS VENT OR LINER WILL PREVENT
DETERIORATION OF THE CHIMNEY DUE TO
THE EXCESSIVE CONDENSATION WHICH
RESULTS ON OVERSIZED SYSTEMS.
WARNING
UNDER NO CIRCUMSTANCES SHOULD THE
FLUE PIPE BE CONNECTED TO THE
CHIMNEY OF AN OPEN FIREPLACE.
TABLE 1.8.7A
WATER BOILER & STEAM BOILERS TO 50 PSIG
TABLE 1.8.7B
(STEAM BOILERS OVER 50 PSIG)
Diameter of
Connector, Inches
Minimum Thickness,
Inch (Gauge)
Diameter of
Connector, Inches
Minimum Thickness,
Inch (Gauge)
6 to 10 0.023 (24) 14 and less 0.053 (16)
10 to 12 0.029 (22) 14 to 16 0.067 (14)
12 to 16 0.034 (20) 16 to 18 0.093 (12)
16 + 0.056 (16) 18 + 0.123 (10)