Page 546 - 2018_IRC

CHIMNEYS AND VENTS

TABLE M1803.3.4 M1804.2 Termination. Vent termination shall comply with
CHIMNEY AND VENT CONNECTOR CLEARANCES Sections M1804.2.1 through M1804.2.6.
a
TO COMBUSTIBLE MATERIALS
M1804.2.1 Through the roof. Vents passing through a
MINIMUM
TYPE OF CONNECTOR CLEARANCE roof shall extend through flashing and terminate in accor-
(inches) dance with the manufacturer’s installation requirements.
Single-wall metal pipe connectors: M1804.2.2 Decorative shrouds. Decorative shrouds shall
Oil and solid-fuel appliances 18 not be installed at the termination of vents except where
Oil appliances listed for use with Type L vents 9
the shrouds are listed and labeled for use with the specific
Type L vent piping connectors: venting system and are installed in accordance with the
Oil and solid-fuel appliances 9 manufacturer’s instructions.
Oil appliances listed for use with Type L vents 3 b
M1804.2.3 Natural draft appliances. Vents for natural
For SI: 1 inch = 25.4 mm. draft appliances shall terminate not less than 5 feet (1524
a. These minimum clearances apply to unlisted single-wall chimney and
vent connectors. Reduction of required clearances is permitted as in Table mm) above the highest connected appliance outlet, and
M1306.2. natural draft gas vents serving wall furnaces shall termi-
b. Where listed Type L vent piping is used, the clearance shall be in nate at an elevation not less than 12 feet (3658 mm) above
accordance with the vent listing. the bottom of the furnace.
M1803.3.5 Access. The entire length of a connector shall M1804.2.4 Type L vent. Type L venting systems shall
allow access for inspection, cleaning and replacement. conform to UL 641 and shall terminate with a listed and
M1803.4 Connection to fireplace flue. Connection of appli- labeled cap in accordance with the vent manufacturer’s
ances to chimney flues serving fireplaces shall comply with installation instructions not less than 2 feet (610 mm)
Sections M1803.4.1 through M1803.4.4. above the roof and not less than 2 feet (610 mm) above
M1803.4.1 Closure and accessibility. A noncombustible any portion of the building within 10 feet (3048 mm).
seal shall be provided below the point of connection to M1804.2.5 Direct vent terminations. Vent terminals for
prevent entry of room air into the flue. Means shall be pro- direct-vent appliances shall be installed in accordance
vided for access to the flue for inspection and cleaning. with the manufacturer’s instructions.
M1803.4.2 Connection to factory-built fireplace flue. A M1804.2.6 Mechanical draft systems. Mechanical draft
different appliance shall not be connected to a flue serving systems shall comply with UL 378 and shall be installed in
a factory-built fireplace unless the appliance is specifi- accordance with their listing, the manufacturer’s instruc-
cally listed for such an installation. The connection shall tions and, except for direct-vent appliances, the following
be made in compliance with the appliance manufacturer’s requirements:
instructions.
1. The vent terminal shall be located not less than 3
M1803.4.3 Connection to masonry fireplace flue. A feet (914 mm) above a forced air inlet located within
connector shall extend from the appliance to the flue serv- 10 feet (3048 mm).
ing a masonry fireplace to convey the flue gases directly 2. The vent terminal shall be located not less than 4
into the flue. The connector shall be provided with access feet (1219 mm) below, 4 feet (1219 mm) horizon-
or shall be removable for inspection and cleaning of both tally from, or 1 foot (305 mm) above any door, win-
the connector and the flue. Listed direct-connection dow or gravity air inlet into a dwelling.
devices shall be installed in accordance with their listing.
3. The vent termination point shall be located not
M1803.4.4 Size of flue. The size of the fireplace flue shall closer than 3 feet (914 mm) to an interior corner
be in accordance with Section M1805.3.1.
formed by two walls perpendicular to each other.
4. The bottom of the vent terminal shall be located not
SECTION M1804 less than 12 inches (305 mm) above finished ground
VENTS level.
M1804.1 Type of vent required. Appliances shall be pro- 5. The vent termination shall not be mounted directly
vided with a listed and labeled venting system as set forth in above or within 3 feet (914 mm) horizontally of an
Table M1804.1. oil tank vent or gas meter.
TABLE M1804.1 6. Power exhauster terminations shall be located not
VENT SELECTION CHART less than 10 feet (3048 mm) from lot lines and adja-
VENT TYPES APPLIANCE TYPES cent buildings.
Oil-burning appliances listed and labeled for
Type L oil vents 7. The discharge shall be directed away from the build-
venting with Type L vents
ing.
Pellet fuel-burning appliances listed and
Pellet vents M1804.3 Installation. Type L and pellet vents shall be
labeled for use with pellet vents
installed in accordance with the terms of their listing and
label and the manufacturer’s instructions.

2018 INTERNATIONAL RESIDENTIAL CODE ® 521
Copyrighted © 2017 by, or licensed to, ICC (ALL RIGHTS RESERVED); licensed to UL, LLC pursuant to License Agreement with ICC. No further reproductions authorized or distribution authorized.
ANY UNAUTHROIZED REPRODUCTION OR DISTRIBUTION IS A VIOLATION OF THE FEDERAL COPYRIGHT ACT AND THE LICENSE AGREEMENT; AND SUBJECT TO CIVIL AND CRIMINAL PENALTIES THEREUNDER.