VENT PIPE MAY BE TYPE
8-VENT, EITHER RIGID OR SUIT-
ABLE FLEXIBLE CONSTRUCTION
THAT CARRIES A U.L. LISTING.
COMMON VENTING IS ALLOW-
ABLE WITH VERTICAL 8-VENT
SYSTEMS, ANO LINED MASONRY
CHIMNEYS. FOLLOW THE
NATIONAL FUEL GAS CODE
VENTING TABLES FOR PROPER
INSTALLATION PROCEDURES.
SINGLE WALL B-VENT CON-
NECTORS TO B-VENT OR
MASONRY CHIMNEYS MAY BE
USED UNDER THE GUIDELINES
OF THE NATIONAL FUEL GAS
CODE VENTING TABLES.
The entire length of the vent
connector must be readily
accessible for inspection,
cleaning and replacement.
VERTICAL VENTING WITH 8-VENT
Type B-vent must be installed in
accordance with the terms of their
listings and the vent manufacturer's
instructions. It must originate with an
adapter at the furnace flue collar or
with a single wall vent connector from
the flue collar to the B-vent and
terminate either in a listed cap or roof
assembly. Support and space B-vent
in accordance with their listings and
the manufacturer's instructions.
Support all vents to maintain their
minimum clearances from
combustible material.
TABLE20
VERTICAL VENTING
BTUH
CATEGORIZED
INPUT
FURNACEVENT
MIN. SIZE REQUIRED
45.000
3"
50,000
3"
67,500 *4"
75,000
*4"
100,000 *4"
125,000
*4"
150,000
*5"
*NOTE: All furnaces have a 3" vent
connection as shipped from the
factory.
A 3" to 4" or 3" to 5" vent
transition is required on all but the
45,000 and 50,000 BTUH models
when vertically vented or common
vented with metal vent pipe. The
vent transition connection must
be made at the furnace vent exit.
When common venting, the vent
connector size may be larger than
the above diameters depending on
application. See National Fuel Gas
Code Tables.
FIGURE 28
DEDICATED VENTING
THROUGH CHIMNEY
WITH B-VENT
A WARNING: NEVER CONNECT
THIS FURNACE TO
A CHIMNEY
USED TO VENT A SOLID FUEL
APPLIANCE (WOOD OR COAL).
HAZARDOUS CONDITIONS MAY
RESULT POSSIBLY CAUSING
PROPERTY DAMAGE FROM FIRE
OR EXPLOSION OR SERIOUS
PERSONAL INJURY INCLUDING
DEATH FROM CARBON
MONOXIDE POISONING.
YENTCAP
(
f
34
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