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)
1.8.8 VENT CONNECTORS (HORIZONTAL RUNS)
CONSTRUCTION
Vent connectors may be of any of the acceptable
constructions listed in this manual.
AVOID UNNECESSARY BENDS
The vent connector must be installed so as to
avoid turns or other construction features which
create excessive resistance to flow of flue gases.
JOINTS
Vent connectors must be firmly attached to draft
diverter outlets or boiler flue collars by sheet
metal screws or other approved means. Vent
connectors of Type B vent material must be
assembled in accordance with the vent
manufacturer's instructions. Joints between
sections of connector piping must be fastened
using sheet metal screws or other approved
means.
SLOPE OR VENT CONNECTOR
The vent connector must be installed without any
dips or sags and must slope upward at least 1/4
inch per foot.
LENGTH OF VENT CONNECTOR
The vent connector must be as short as possible
and the boiler close as practical to the chimney or
vent.
The horizontal run of an uninsulated vent
connector to a natural draft chimney or vent
servicing a single appliance must not be more
than 75% of the height of the chimney or vent
above the vent connector.
The horizontal run of an insulated vent connector
to a natural draft chimney or vent servicing a
single appliance must not exceed 100% of the
height of the chimney or vent above the vent
connector.
SUPPORT OF VENT CONNECTOR
The vent connector must be supported in
accordance with the vent manufacturer's
instructions and listing and with all applicable
codes. Support should also be independent of the
boiler or the draft diverter (when used). The vent
connector must be: supported for the design and
weight of the materials employed, maintain
clearances, prevent physical damage and
separation of joints, and to prevent sagging of the
vent connector.
Supports should usually be overhead hangers,
and of load bearing capacity appropriate for the
weight involved.
LOCATION
When the vent connector used for an appliance
having a draft hood must be located in or pass
though a crawl space or other area difficult to
access or which may be cold, that portion of the
vent connector must be of listed double wall Type
B gas vent material, or of material having
equivalent insulation qualities. Single wall metal
Содержание AB Series
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