Installation
APPLICATION
UL 103 Building Heating Appliance Chimney Listing:
Under this category, models DIS and DAS have been determined suitable
for venting flue gases at temperatures not exceeding 538°C (1000°F)
under continuous operating conditions from gas, liquid, oil or solid fuel
fired appliances. Also complies with operation (less than one hour)
at temperatures not exceeding 740°C (1400°F) and brief operation
(maximum 10 minutes) at temperatures not exceeding 906°C (1700°F).
Building Heating Appliance Chimneys are suitable for use with Build-
ing Heating Appliances and Low Heat Appliances as described in the
Chimney Selection Chart of National Fire Protection Association (NFPA)
Standard NO. 211.
UL 103 1400°F Chimney Listing:
Under this category, models DIS and DAS have been determined suitable
for venting flue gases at temperatures not exceeding 760°C (1400°F)
under continuous operating conditions from gas, liquid, oil or solid
fuel fired appliances. Also complies with brief operation (maximum 10
minutes) at temperatures not exceeding 906°C (1700°F). As such, it is
suitable for use with ovens and furnaces as described in the Chimney
Selection Chart of NFPA No. 211, in addition to other applications.
UL 103 Positive Pressure Listing:
Under this category, models DIS and DAS have been determined suit-
able for use at a maximum of 60 inch water column internal pressure.
ULC-C959 540°C and 760°C Industrial Chimneys Listing:
Under this category, models DIS and DAS have been determined suitable
for venting flue gases at temperatures not exceeding 760°C (1400°F)
under continuous operating conditions from gas, liquid, oil or solid
fuel fired appliances. Also complies with brief operation (maximum 10
minutes) at temperatures not exceeding 980°C (1800°F).
UL 1978 Grease Ducts Listing (DIS only):
Duravent model DIS chimney is tested in accordance with UL 1978
Standard and approved for Grease Duct applications when installed in
accordance with these installation instructions and National Fire Protec-
tion Association standard “NFPA 96, Standard for Ventilation Control
and Fire Protection of Commercial Cooking Operations”.
SURROUNDINGS / ENCLOSURE
Boiler and Engine Exhaust
Duravent models DIS and DAS chimney are primarily intended to be
used in fire resistive noncombustible surroundings or installed unen-
closed. They are not intended for use in one or two family residences.
(CAUTION: Do not enclose this chimney in a chase or passageway of
ordinary wood or other combustible material).
Where the chimney extends through any zone of a building (outside
that in which the heating appliance connected to it is located), it shall
be provided with an enclosure having a fire resistance rating equal to
or greater than that of the floor, wall or roof assemblies through which
it passes.
Duravent models DIS and DIS chimney may penetrate a combustible
floor, wall or roof using the appropriate parts and openings sizes. See
section D “Roof & Wall Penetration” for more details.
Where, according to local code, no chase enclosure is necessary, models
DIS and DAS chimney may be placed adjacent to walls of combustible
construction at the clearance specified on each chimney section and
in the individual listing; see “CLEARANCES”. Contact local building or
fire officials about restrictions and installation inspection requirements
in your area.
Grease Ducts (DIS Only)
1. Model DIS grease ducts are primarily intended for installation in
noncombustible surroundings or in unenclosed installations.
2. Where model DIS grease ducts are installed in an open room and an
enclosure is not required, the minimum clearance to adjacent combus-
tible walls shall be as shown in this section (see “CLEARANCES”). The
ducting may be located in a corner formed by two walls of combustible
construction, if the conditions above are met.
3. Other interior installations in all buildings should be as follows:
a) Where a grease duct penetrates a wall or ceiling rated for fire re-
sistance, it should be enclosed with a continuous non-combustible
enclosure extending from the lowest fire-rated ceiling or floor
above the hood, through any concealed space, to or through the
roof so as to maintain the integrity of the fire separations required
by the applicable building code provisions. The enclosure shall be
sealed around the duct at the point of penetration of the lowest
fire-rated ceiling or floor above the hood, in order to maintain the
fire resistance rating of the enclosure and shall be extended to
the exterior of the building through weather-protected openings.
b) A grease duct penetrating a ceiling, floor or wall which does not
have a fire resistance rating does not require to be enclosed, if
the clearances to combustibles are at the correct minimum for
unenclosed installations.
c) Where model DIS grease ducts extend through any story of a
building above the floor on which the connected appliances are
located, they shall be enclosed in the upper stories with walls
having a fire resistance rating of not less than one hour for
buildings of two or three stories. If the building is four stories
or more, the enclosure wall shall have a fire resistance rating of
not less than two hours.
4. Combustible roofs or roof-ceiling assemblies may be penetrated as
described in Section D – Roof and wall penetrations.
NOTE: Do not enclose with combustible materials. Refer to NFPA 96,
“ Standard For Ventilation Control And Fire Protection Of Commercial
Cooking Operations”, for installation and clearances of fire-rated
enclosures and definitions.
SYSTEM SIZING
Complete system sizing and capacity information maybe obtained from
the “Chimney, Gas Vent, and Fireplace Systems” chapter of the ASHRAE
Handbook (go to www.ashrae.org for more information). In spite of these
general sizing guidelines, it is most important that the heating appliance,
engine or turbine manufacturer’s installation instructions are followed.
Not following the equipment manufacturer’s instructions may result in
inadequate chimney performance and/or a violation of the equipment
manufacturer’s installation requirements.
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