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Category I - Installation of Vent/Air Piping
SECTION IV - Category I Installation
of Vent Air/Piping
General Requirements - Category I
(PG-150 & PG-199 only)
The venting system must be installed in accordance
with:
-
NFPA 54 National Fuel Gas Code, ANSI Z223.1.
-
NFPA 211 Standard for Chimneys, Vent and
Solid Fuel Burning Appliances.
For installations in Canada the venting system must be
installed in accordance with:
-
CSA / B149 Installation Code for Gas Burning
Equipment.
-
Prior to installing the appliance into an existing
chimney or venting system, the vent system
should be inspected for condition and obstructions.
If the inspection reveals the vent system is not
safe for the intended use, it shall be repaired,
rebuilt, lined, relined or replaced with a vent or
chimney to conform to NFPA 211, latest edition.
Failure to conduct such an inspection and/or
repair could result in severe personal injury,
death or substantial property damage.
-
No portion of the venting system shall extend
into or pass through any circulating air duct or
furnace plenum.
-
The gas venting system shall be installed, in
accordance with their listings and the manufac-
turer’s instructions.
Masonry and Metal Chimneys
-
The NFPA code book severely limits the instal-
lation of the MODULATING DELTA into a
masonry chimney. For applications using either
interior or exterior masonry chimney a listed,
approved metal chimney lining system should
be used.
For any applications using an exterior chimney it
is recommended that an insulated or stainless
steel chimney lining system be used.
BEST PRACTICE
WARNING
A chimney with one or more sides exposed to
the outside of the structure is considered to be
an exterior chimney.
-
The chimney shall extend at least 5 feet above
the highest connected appliance flue collar.
-
The chimney shall extend at least 3 feet above
the highest point where it passes through a roof
of a building and at least 2 feet higher than any
portion of a building within a horizontal distance
of 10 feet.
Type B Vent Systems
-
The vent system should terminate in accor-
dance with NFPA 54, latest edition, provided the
termination is at least 8 feet from a vertical wall
or similar obstruction.
The Type B vent system shall extend in a gener-
al vertical direction with offsets not exceeding
45
º
. A vent system having not more than one 60
º
offset shall be permitted. Any angle greater than
45
º
is considered horizontal.
The total horizontal distance of a vent plus the
horizontal vent connector shall not be greater
than 75% of the vertical height of the vent.
Vent Connectors
-
When a vent connector must be located in or
pass through an un-conditioned space, attic or
crawl space, that portion of the vent connector
must be listed as Type B or other approved
material having equivalent insulation qualities.
-
The minimum clearance to combustibles for sin-
gle wall vent connectors shall be 6 inches.
-
The minimum clearance to combustibles for
Type B vent connectors shall be 1 inch or per
vent manufacturer’s instructions.
-
The vent connector shall be installed in a man-
ner to avoid excessive turns or other construc-
tion features that create excessive resistance to
the flow of the vent gases.
BEST PRACTICE
BEST PRACTICE
NOTICE
