JI
VERTICAL VENT SYSTEMS 3.
Must rise 1/4" per foot away from
the furnace on horizontal runs
1.
A gas vent shall terminate above
and be supported with straps or
the roof surface with a listed cap
hangers so it has no sags or
or listed roof assembly. Gas
dips. Use supports at 4 foot
vents 12 inches in size or smaller
intervals and at all elbows.
with listed caps shall be
Horizontal connectors should not
permitted to be terminated in
exceed 75% of the vent height.
accordance with Figure 29,
provided they are at least 8 feet 4. Mechanically attach the
vent
from a vertical wall or similiar connector to the furnace outlet
obstruction. All other gas
vents collar with at least (2) sheet
shall terminate not less than 2
metal screws, except B-vent
feet above the highest point
connectors. Assemble these in
where they pass through the roof
accordance with the
and at least 2 feet higher than manufacturer's instructions.
any portion of a building within
NOTE: Refer to the National Fuel
10 feet.
Gas Code venting tables for venting
2. B-vent type gas
vent shall Category I furnaces.
terminate at least 5 feet in
vertical height above the highest
connected equipment draft hood
or flue collar.
FIGURE 29
TYPICAL VENTING WITH "B-VENT"
MIN. DISCHARGE OPENING
LISTED CAP
LISTED GAS VENT
12
"H"' • MINIMUM ALLOWABLE HEIGHT
FROM ROOF TO DISCHARGE OPENING
SINGLE APPLIANCE VENTING OF
A FAN-ASSISTED FURNACE INTO
A TILE-LINED MASONRY
CHIMNEY IS PROHIBITED. THE
CHIMNEY MUST BE LINED WITH
EITHER TYPE B VENT OR WITH A
LISTED SINGLE WALL METAL
LINING SYSTEM. REFER TO THE
NATIONAL FUEL GAS CODE
VENTING TABLES.
A WARNING: DO NOT CONNECT
THIS FURNACE TO A CHIMNEY
THAT VENTS A SOLID FUEL
APPLIANCE (WOOD OR COAL).
VENTING WITH A SOLID FUEL
APPLIANCE CAN LEAD TO
IMPROPER UNIT FUNCTIONING,
AND DUE TO SOOTING, THE
POSSIBILITY OF FIRE RESULTING
IN PROPERTY DAMAGE,
PERSONAL INJURY OR DEATH.
SPECIALVENT
SYSTEM(S.V.S.)
HIGH TEMPERATURE PLASTIC
VENTING
GENERAL INFORMATION
IMPORTANT: IT IS THE MANU-
FACTURER'S POSITION NOW
THAT NEW INSTALLATIONS OF
ANY HTPV PIPE USED IN A
CATEGORY Ill VENT APPLICA-
TION, INCLUDING SELKIRK'S
SELVENT™ II HTPV PRODUCT.
SHOULD CEASE IMMEDIATELY.
ROOFPITCH
"'H" (MIN.) FT.
FLAT TO 6/12 1.0
OVER 6/12 TO 7/12 1.25
OVER 7/12 TO 8/12 1.5
OVER 8/12 TO 9/12
2.0
OVER 9/12 TO 10/12 2.5
OVER 10/12 TO 11/12 3.25
OVER 11/12TO 12/12 4.0
OVER 12/12TO 14/12 5.0
OVER 14/12 TO 16/12
6.0
OVER 16/12 TO 18/12 7.0
OVER 18/12 TO 20/12 7.5
OVER 20/12 TO 21/12 8.0
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