International Building Code Section 712


International Building Code 712.1

Scope. The provisions of this section shall govern the
materials and methods of construction used to protect through
penetrations and membrane penetrations of horizontal assemblies
and fire-resistance-rated wall assemblies.

International Building Code 712.2

Installation details. Where sleeves are used, they shall
be securely fastened to the assembly penetrated. The space
between the item contained in the sleeve and the sleeve itself
and any space between the sleeve and the assembly penetrated
shall be protected in accordance with this section. Insulation
and coverings on or in the penetrating item shall not penetrate
the assembly unless the specific material used has been tested
as part of the assembly in accordance with this section.

International Building Code 712.3

Fire-resistance-rated walls. Penetrations into or
through fire walls, fire-barrier walls, smoke-barrier walls and
fire partitions shall comply with Sections 712.3.1 through
712.3.4.

Through penetrations. Through penetrations of
fire-resistance-rated walls shall comply with Section
712.3.1.1 or 712.3.1.2.
Exception: Where the penetrating items are steel, ferrous
or copper pipes, tubes or conduits, the annular space
between the penetrating item and the fire-resistance-
rated wall is permitted to be protected as follows:
1. In concrete or masonry walls where the penetrating
item is a maximum 6-inch (152 mm) nominal
diameter and the area of the opening through the
wall does not exceed 144 square inches (0.0929
m2), concrete, grout or mortar is permitted where it
is installed the full thickness of the wall or the
thickness required to maintain the fire-resistance
rating; or
2. The material used to fill the annular space shall
prevent the passage of flame and hot gases sufficient
to ignite cotton waste when subjected to
ASTM E 119 time-temperature fire conditions
under a minimum positive pressure differential of
0.01 inch (2.49 Pa) of water at the location of the
penetration for the time period equivalent to the
fire-resistance rating of the construction penetrated.

Fire-resistance-rated assemblies. Penetrations
shall be installed as tested in an approved fire-resistance-
rated assembly.

Through-penetration firestop system.
Through penetrations shall be protected by an approved
penetration firestop system installed as tested in accordance
with ASTM E 814 or UL 1479, with a minimum
positive pressure differential of 0.01 inch (2.49 Pa) of
water and shall have an F rating of not less than the
required fire-resistance rating of the wall penetrated.

Membrane penetrations. Membrane penetrations
shall comply with Section 712.3.1. Where walls or partitions
are required to have a fire-resistance rating, recessed
fixtures shall be installed such that the required fire resistance
will not be reduced.
Exceptions:
1. Membrane penetrations of maximum two-hour
fire-resistance-rated walls and partitions by steel
electrical boxes that do not exceed 16 square
inches (0.0103 m2) in area, provided the aggregate
area of the openings through the membrane does
not exceed 100 square inches (0.0645 m2) in any
100 square feet (9.29m2) of wall area. The annular
space between the wall membrane and the box
shall not exceed 1/8 inch (3.1 mm). Such boxes on
opposite sides of the wall or partition shall be separated
by one of the following:
1.1. By a horizontal distance of not less than 24
inches (610 mm);
1.2. By a horizontal distance of not less than the
depth of the wall cavity where the wall cavity
is filled with cellulose loose-fill,
rockwool or slag mineral wool insulation;
1.3. By solid fireblocking in accordance with
Section 717.2.1;
1.4. By protecting both outlet boxes with listed
putty pads; or
1.5. By other listed materials and methods.
2. Membrane penetrations by listed electrical boxes
of any material, provided such boxes have been
tested for use in fire-resistance-rated assemblies
and are installed in accordance with the instructions
included in the listing. The annular space
between the wall membrane and the box shall not
exceed 1/8 inch (3.1 mm) unless listed otherwise.
Such boxes on opposite sides of the wall or
partition shall be separated as follows:
2.1. By a horizontal distance of not less than 24
inches (610 mm);
2.2. By solid fireblocking in accordance with
Section 717.2.1;
2.3. By protecting both boxes with listed putty
pads; or
2.4. By other listed materials and methods.
3. The annular space created by the penetration of a
fire sprinkler, provided it is covered by a metal
escutcheon plate.
Ducts and air transfer openings. Penetrations of
fire-resistance-rated walls by ducts that are not protected
with dampers shall comply with Sections 712.2 through
712.3.1. Ducts and air transfer openings that are protected
with dampers shall comply with Section 716.

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible items beyond the
point of firestopping unless it can be demonstrated that the
fire-resistance integrity of the wall is maintained.

International Building Code 712.3.1

Through penetrations. Through penetrations of
fire-resistance-rated walls shall comply with Section
712.3.1.1 or 712.3.1.2.
Exception: Where the penetrating items are steel, ferrous
or copper pipes, tubes or conduits, the annular space
between the penetrating item and the fire-resistance-
rated wall is permitted to be protected as follows:
1. In concrete or masonry walls where the penetrating
item is a maximum 6-inch (152 mm) nominal
diameter and the area of the opening through the
wall does not exceed 144 square inches (0.0929
m2), concrete, grout or mortar is permitted where it
is installed the full thickness of the wall or the
thickness required to maintain the fire-resistance
rating; or
2. The material used to fill the annular space shall
prevent the passage of flame and hot gases sufficient
to ignite cotton waste when subjected to
ASTM E 119 time-temperature fire conditions
under a minimum positive pressure differential of
0.01 inch (2.49 Pa) of water at the location of the
penetration for the time period equivalent to the
fire-resistance rating of the construction penetrated.

Fire-resistance-rated assemblies. Penetrations
shall be installed as tested in an approved fire-resistance-
rated assembly.

Through-penetration firestop system.
Through penetrations shall be protected by an approved
penetration firestop system installed as tested in accordance
with ASTM E 814 or UL 1479, with a minimum
positive pressure differential of 0.01 inch (2.49 Pa) of
water and shall have an F rating of not less than the
required fire-resistance rating of the wall penetrated.

International Building Code 712.3.1.1

Fire-resistance-rated assemblies. Penetrations
shall be installed as tested in an approved fire-resistance-
rated assembly.

International Building Code 712.3.1.2

Through-penetration firestop system.
Through penetrations shall be protected by an approved
penetration firestop system installed as tested in accordance
with ASTM E 814 or UL 1479, with a minimum
positive pressure differential of 0.01 inch (2.49 Pa) of
water and shall have an F rating of not less than the
required fire-resistance rating of the wall penetrated.

International Building Code 712.3.2

Membrane penetrations. Membrane penetrations
shall comply with Section 712.3.1. Where walls or partitions
are required to have a fire-resistance rating, recessed
fixtures shall be installed such that the required fire resistance
will not be reduced.
Exceptions:
1. Membrane penetrations of maximum two-hour
fire-resistance-rated walls and partitions by steel
electrical boxes that do not exceed 16 square
inches (0.0103 m2) in area, provided the aggregate
area of the openings through the membrane does
not exceed 100 square inches (0.0645 m2) in any
100 square feet (9.29m2) of wall area. The annular
space between the wall membrane and the box
shall not exceed 1/8 inch (3.1 mm). Such boxes on
opposite sides of the wall or partition shall be separated
by one of the following:
1.1. By a horizontal distance of not less than 24
inches (610 mm);
1.2. By a horizontal distance of not less than the
depth of the wall cavity where the wall cavity
is filled with cellulose loose-fill,
rockwool or slag mineral wool insulation;
1.3. By solid fireblocking in accordance with
Section 717.2.1;
1.4. By protecting both outlet boxes with listed
putty pads; or
1.5. By other listed materials and methods.
2. Membrane penetrations by listed electrical boxes
of any material, provided such boxes have been
tested for use in fire-resistance-rated assemblies
and are installed in accordance with the instructions
included in the listing. The annular space
between the wall membrane and the box shall not
exceed 1/8 inch (3.1 mm) unless listed otherwise.
Such boxes on opposite sides of the wall or
partition shall be separated as follows:
2.1. By a horizontal distance of not less than 24
inches (610 mm);
2.2. By solid fireblocking in accordance with
Section 717.2.1;
2.3. By protecting both boxes with listed putty
pads; or
2.4. By other listed materials and methods.
3. The annular space created by the penetration of a
fire sprinkler, provided it is covered by a metal
escutcheon plate.

International Building Code 712.3.3

Ducts and air transfer openings. Penetrations of
fire-resistance-rated walls by ducts that are not protected
with dampers shall comply with Sections 712.2 through
712.3.1. Ducts and air transfer openings that are protected
with dampers shall comply with Section 716.

International Building Code 712.3.4

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible items beyond the
point of firestopping unless it can be demonstrated that the
fire-resistance integrity of the wall is maintained.

International Building Code 712.4

Horizontal assemblies. Penetrations of a floor,
floor/ceiling assembly or the ceiling membrane of a roof/ceiling
assembly shall be protected in accordance with Section
707.

Fire-resistance rated assemblies. Penetrations of
the fire-resistance rated floor, floor/ceiling assembly or the
ceiling membrane of a roof/ceiling assembly shall comply
with Sections 712.4.1.1 through 714.4.1.5

Through penetrations. Through penetrations
of fire-resistance-rated horizontal assemblies shall comply
with Section 712.4.1.1.1 or 712.4.1.1.2.
Exceptions:
1. Penetrations by steel, ferrous or copper conduits,
pipes, tubes or vents or concrete or
masonry items through a single fire-resistance-
rated floor assembly where the annular
space is protected with materials that prevent
the passage of flame and hot gases sufficient to
ignite cotton waste when subjected to ASTM E
119 time-temperature fire conditions under a
minimum positive pressure differential of 0.01
inch (2.49 Pa) of water at the location of the
penetration for the time period equivalent to the
fire-resistance rating of the construction penetrated.
Penetrating items with a maximum
6-inch (152 mm) nominal diameter shall not be
limited to the penetration of a single fire-resistance-
rated floor assembly, provided the aggregate
area of the openings through the assembly
does not exceed 144 square inches (92 900
mm2) in any 100 square feet (9.3 m2) of floor
area.
2. Penetrations in a single concrete floor by steel,
ferrous or copper conduits, pipes, tubes or vents
with a maximum 6-inch (152 mm) nominal
diameter, provided the concrete, grout or mortar
is installed the full thickness of the floor or
the thickness required to maintain the fire-resistance
rating. The penetrating items shall not be
limited to the penetration of a single concrete
floor, provided the area of the opening through
each floor does not exceed 144 square inches
(92 900 mm2).
3. Penetrations by listed electrical boxes of any
material, provided such boxes have been tested
for use in fire-resistance-rated assemblies and
installed in accordance with the instructions
included in the listing.

Installation. Through penetrations shall
be installed as tested in the approved fire-resistance-
rated assembly.

Through-penetration firestop system.
Through penetrations shall be protected by an
approved through-penetration firestop system
installed and tested in accordance with ASTM E 814
or UL 1479, with a minimum positive pressure differential
of 0.01 inch ofwater (2.49 Pa). The system shall
have an F-rating and a T-rating of not less than 1 hour
but not less than the required rating of the floor penetrated.
Exception: Floor penetrations contained and
located within the cavity of a wall do not require a
T- rating.

Membrane penetrations. Penetrations of
membranes that are part of a fire-resistance-rated horizontal
assembly shall comply with Section 712.4.1.1.1
or 712.4.1.1.2. Where floor/ceiling assemblies are
required to have a minimum 1-hour fire-resistance rating,
recessed fixtures shall be installed such that the
required fire resistance will not be reduced.
Exceptions:
1. Membrane penetrations of maximum 2-hour
fire-resistance-rated walls and partitions by
steel, ferrous or copper conduits, pipes, tubes or
vents, or concrete or masonry items where the
annular space is protected either in accordance
with Section 712.4.1.1 or to prevent the free
passage of flame and the products of combustion.
The aggregate area of the openings
through the membrane shall not exceed 100
square inches (64 500 mm2) in any 100 square
feet (9.3m2) of ceiling area in assemblies tested
without penetrations.
2. Ceiling membrane penetrations of maximum
2-hour fire-resistance-rated horizontal assemblies
by steel electrical boxes that do not exceed
16 square inches (10 323 mm2) in area, provided
the aggregate area of such penetrations
does not exceed 100 square inches (44 500
mm2) in any 100 square feet (9.29m2) of ceiling
area, and the annular space between the ceiling
membrane and the box does not exceed 1/8 inch
(3.12 mm).
3. Membrane penetrations by listed electrical
boxes of any material, provided such boxes
have been tested for use in fire-resistance-rated
assemblies and are installed in accordance with
the instructions included in the listing. The
annular space between the ceiling membrane
and the box shall not exceed 1/8 inch (3.1 mm)
unless listed otherwise.
4. The annular space created by the penetration of
a fire sprinkler, provided it is covered by a
metal eschutcheon plate.

Ducts and air transfer openings. Penetrations
of horizontal assemblies by ducts and air transfer
openings shall comply with Section 716.

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible materials
beyond the point of firestopping unless it can be demonstrated
that the fire-resistance integrity of the horizontal
assembly is maintained.

Floor fire doors. Floor fire doors used to protect
openings in fire-resistance-rated floors shall be
tested in accordance with NFPA 288, and shall achieve a
fire-resistance rating not less than the assembly being
penetrated. Floor fire doors shall be labeled by an
approved agency.

Nonfire-resistance-rated assemblies. Penetrations
of horizontal assemblies without a required fire-resistance
rating shall meet the requirements of Section 707 or
shall comply with Section 712.4.2.1 or 712.4.2.2.

Noncombustible penetrating items.
Noncombustible penetrating items that connect not more
than three stories are permitted, provided that the annular
space is filled with an approved noncombustible material
to resist the free passage of flame and the products of
combustion.

Penetrating items. Penetrating items that connect
not more than two stories are permitted, provided
that the annular space is filled with an approved material
to resist the free passage of flame and the products of
combustion.

Ducts and air transfer openings. Penetrations of
horizontal assemblies by ducts that are not protected with
dampers shall comply with Section 712.2 and Sections
712.4 through 712.4.2.2. Ducts and air transfer openings
that are protected with dampers shall comply with Section
716.

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible materials beyond the
point of firestopping unless it can be demonstrated that the
fire-resistance integrity of the horizontal assembly is maintained.

International Building Code 712.4.1

Fire-resistance rated assemblies. Penetrations of
the fire-resistance rated floor, floor/ceiling assembly or the
ceiling membrane of a roof/ceiling assembly shall comply
with Sections 712.4.1.1 through 714.4.1.5

Through penetrations. Through penetrations
of fire-resistance-rated horizontal assemblies shall comply
with Section 712.4.1.1.1 or 712.4.1.1.2.
Exceptions:
1. Penetrations by steel, ferrous or copper conduits,
pipes, tubes or vents or concrete or
masonry items through a single fire-resistance-
rated floor assembly where the annular
space is protected with materials that prevent
the passage of flame and hot gases sufficient to
ignite cotton waste when subjected to ASTM E
119 time-temperature fire conditions under a
minimum positive pressure differential of 0.01
inch (2.49 Pa) of water at the location of the
penetration for the time period equivalent to the
fire-resistance rating of the construction penetrated.
Penetrating items with a maximum
6-inch (152 mm) nominal diameter shall not be
limited to the penetration of a single fire-resistance-
rated floor assembly, provided the aggregate
area of the openings through the assembly
does not exceed 144 square inches (92 900
mm2) in any 100 square feet (9.3 m2) of floor
area.
2. Penetrations in a single concrete floor by steel,
ferrous or copper conduits, pipes, tubes or vents
with a maximum 6-inch (152 mm) nominal
diameter, provided the concrete, grout or mortar
is installed the full thickness of the floor or
the thickness required to maintain the fire-resistance
rating. The penetrating items shall not be
limited to the penetration of a single concrete
floor, provided the area of the opening through
each floor does not exceed 144 square inches
(92 900 mm2).
3. Penetrations by listed electrical boxes of any
material, provided such boxes have been tested
for use in fire-resistance-rated assemblies and
installed in accordance with the instructions
included in the listing.

Installation. Through penetrations shall
be installed as tested in the approved fire-resistance-
rated assembly.

Through-penetration firestop system.
Through penetrations shall be protected by an
approved through-penetration firestop system
installed and tested in accordance with ASTM E 814
or UL 1479, with a minimum positive pressure differential
of 0.01 inch ofwater (2.49 Pa). The system shall
have an F-rating and a T-rating of not less than 1 hour
but not less than the required rating of the floor penetrated.
Exception: Floor penetrations contained and
located within the cavity of a wall do not require a
T- rating.

Membrane penetrations. Penetrations of
membranes that are part of a fire-resistance-rated horizontal
assembly shall comply with Section 712.4.1.1.1
or 712.4.1.1.2. Where floor/ceiling assemblies are
required to have a minimum 1-hour fire-resistance rating,
recessed fixtures shall be installed such that the
required fire resistance will not be reduced.
Exceptions:
1. Membrane penetrations of maximum 2-hour
fire-resistance-rated walls and partitions by
steel, ferrous or copper conduits, pipes, tubes or
vents, or concrete or masonry items where the
annular space is protected either in accordance
with Section 712.4.1.1 or to prevent the free
passage of flame and the products of combustion.
The aggregate area of the openings
through the membrane shall not exceed 100
square inches (64 500 mm2) in any 100 square
feet (9.3m2) of ceiling area in assemblies tested
without penetrations.
2. Ceiling membrane penetrations of maximum
2-hour fire-resistance-rated horizontal assemblies
by steel electrical boxes that do not exceed
16 square inches (10 323 mm2) in area, provided
the aggregate area of such penetrations
does not exceed 100 square inches (44 500
mm2) in any 100 square feet (9.29m2) of ceiling
area, and the annular space between the ceiling
membrane and the box does not exceed 1/8 inch
(3.12 mm).
3. Membrane penetrations by listed electrical
boxes of any material, provided such boxes
have been tested for use in fire-resistance-rated
assemblies and are installed in accordance with
the instructions included in the listing. The
annular space between the ceiling membrane
and the box shall not exceed 1/8 inch (3.1 mm)
unless listed otherwise.
4. The annular space created by the penetration of
a fire sprinkler, provided it is covered by a
metal eschutcheon plate.

Ducts and air transfer openings. Penetrations
of horizontal assemblies by ducts and air transfer
openings shall comply with Section 716.

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible materials
beyond the point of firestopping unless it can be demonstrated
that the fire-resistance integrity of the horizontal
assembly is maintained.

Floor fire doors. Floor fire doors used to protect
openings in fire-resistance-rated floors shall be
tested in accordance with NFPA 288, and shall achieve a
fire-resistance rating not less than the assembly being
penetrated. Floor fire doors shall be labeled by an
approved agency.

International Building Code 712.4.1.1

Through penetrations. Through penetrations
of fire-resistance-rated horizontal assemblies shall comply
with Section 712.4.1.1.1 or 712.4.1.1.2.
Exceptions:
1. Penetrations by steel, ferrous or copper conduits,
pipes, tubes or vents or concrete or
masonry items through a single fire-resistance-
rated floor assembly where the annular
space is protected with materials that prevent
the passage of flame and hot gases sufficient to
ignite cotton waste when subjected to ASTM E
119 time-temperature fire conditions under a
minimum positive pressure differential of 0.01
inch (2.49 Pa) of water at the location of the
penetration for the time period equivalent to the
fire-resistance rating of the construction penetrated.
Penetrating items with a maximum
6-inch (152 mm) nominal diameter shall not be
limited to the penetration of a single fire-resistance-
rated floor assembly, provided the aggregate
area of the openings through the assembly
does not exceed 144 square inches (92 900
mm2) in any 100 square feet (9.3 m2) of floor
area.
2. Penetrations in a single concrete floor by steel,
ferrous or copper conduits, pipes, tubes or vents
with a maximum 6-inch (152 mm) nominal
diameter, provided the concrete, grout or mortar
is installed the full thickness of the floor or
the thickness required to maintain the fire-resistance
rating. The penetrating items shall not be
limited to the penetration of a single concrete
floor, provided the area of the opening through
each floor does not exceed 144 square inches
(92 900 mm2).
3. Penetrations by listed electrical boxes of any
material, provided such boxes have been tested
for use in fire-resistance-rated assemblies and
installed in accordance with the instructions
included in the listing.

Installation. Through penetrations shall
be installed as tested in the approved fire-resistance-
rated assembly.

Through-penetration firestop system.
Through penetrations shall be protected by an
approved through-penetration firestop system
installed and tested in accordance with ASTM E 814
or UL 1479, with a minimum positive pressure differential
of 0.01 inch ofwater (2.49 Pa). The system shall
have an F-rating and a T-rating of not less than 1 hour
but not less than the required rating of the floor penetrated.
Exception: Floor penetrations contained and
located within the cavity of a wall do not require a
T- rating.

International Building Code 712.4.1.1.1

Installation. Through penetrations shall
be installed as tested in the approved fire-resistance-
rated assembly.

International Building Code 712.4.1.1.2

Through-penetration firestop system.
Through penetrations shall be protected by an
approved through-penetration firestop system
installed and tested in accordance with ASTM E 814
or UL 1479, with a minimum positive pressure differential
of 0.01 inch ofwater (2.49 Pa). The system shall
have an F-rating and a T-rating of not less than 1 hour
but not less than the required rating of the floor penetrated.
Exception: Floor penetrations contained and
located within the cavity of a wall do not require a
T- rating.

International Building Code 712.4.1.2

Membrane penetrations. Penetrations of
membranes that are part of a fire-resistance-rated horizontal
assembly shall comply with Section 712.4.1.1.1
or 712.4.1.1.2. Where floor/ceiling assemblies are
required to have a minimum 1-hour fire-resistance rating,
recessed fixtures shall be installed such that the
required fire resistance will not be reduced.
Exceptions:
1. Membrane penetrations of maximum 2-hour
fire-resistance-rated walls and partitions by
steel, ferrous or copper conduits, pipes, tubes or
vents, or concrete or masonry items where the
annular space is protected either in accordance
with Section 712.4.1.1 or to prevent the free
passage of flame and the products of combustion.
The aggregate area of the openings
through the membrane shall not exceed 100
square inches (64 500 mm2) in any 100 square
feet (9.3m2) of ceiling area in assemblies tested
without penetrations.
2. Ceiling membrane penetrations of maximum
2-hour fire-resistance-rated horizontal assemblies
by steel electrical boxes that do not exceed
16 square inches (10 323 mm2) in area, provided
the aggregate area of such penetrations
does not exceed 100 square inches (44 500
mm2) in any 100 square feet (9.29m2) of ceiling
area, and the annular space between the ceiling
membrane and the box does not exceed 1/8 inch
(3.12 mm).
3. Membrane penetrations by listed electrical
boxes of any material, provided such boxes
have been tested for use in fire-resistance-rated
assemblies and are installed in accordance with
the instructions included in the listing. The
annular space between the ceiling membrane
and the box shall not exceed 1/8 inch (3.1 mm)
unless listed otherwise.
4. The annular space created by the penetration of
a fire sprinkler, provided it is covered by a
metal eschutcheon plate.

International Building Code 712.4.1.3

Ducts and air transfer openings. Penetrations
of horizontal assemblies by ducts and air transfer
openings shall comply with Section 716.

International Building Code 712.4.1.4

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible materials
beyond the point of firestopping unless it can be demonstrated
that the fire-resistance integrity of the horizontal
assembly is maintained.

International Building Code 712.4.1.5

Floor fire doors. Floor fire doors used to protect
openings in fire-resistance-rated floors shall be
tested in accordance with NFPA 288, and shall achieve a
fire-resistance rating not less than the assembly being
penetrated. Floor fire doors shall be labeled by an
approved agency.

International Building Code 712.4.2

Nonfire-resistance-rated assemblies. Penetrations
of horizontal assemblies without a required fire-resistance
rating shall meet the requirements of Section 707 or
shall comply with Section 712.4.2.1 or 712.4.2.2.

Noncombustible penetrating items.
Noncombustible penetrating items that connect not more
than three stories are permitted, provided that the annular
space is filled with an approved noncombustible material
to resist the free passage of flame and the products of
combustion.

Penetrating items. Penetrating items that connect
not more than two stories are permitted, provided
that the annular space is filled with an approved material
to resist the free passage of flame and the products of
combustion.

International Building Code 712.4.2.1

Noncombustible penetrating items.
Noncombustible penetrating items that connect not more
than three stories are permitted, provided that the annular
space is filled with an approved noncombustible material
to resist the free passage of flame and the products of
combustion.

International Building Code 712.4.2.2

Penetrating items. Penetrating items that connect
not more than two stories are permitted, provided
that the annular space is filled with an approved material
to resist the free passage of flame and the products of
combustion.

International Building Code 712.4.3

Ducts and air transfer openings. Penetrations of
horizontal assemblies by ducts that are not protected with
dampers shall comply with Section 712.2 and Sections
712.4 through 712.4.2.2. Ducts and air transfer openings
that are protected with dampers shall comply with Section
716.

International Building Code 712.4.4

Dissimilar materials. Noncombustible penetrating
items shall not connect to combustible materials beyond the
point of firestopping unless it can be demonstrated that the
fire-resistance integrity of the horizontal assembly is maintained.

International Building Code 712.5

Penetrations in smoke barriers. Penetrations in smoke
barriers shall be tested in accordance with the requirements of
UL 1479 for air leakage. The air leakage rate of the penetration
assembly shall not exceed 5.0 cfm per square foot (0.025m3 / s #
m2 ) of penetration opening at 0.30 inch ( 7.47 Pa) of water for
both the ambient temperature and elevated temperature tests.