Minnesota Administrative Rules
Agency 151 - Labor and Industry Department
Chapter 7511 - FIRE CODE
Part 7511.1027 - SECTION 1027, MEANS OF EGRESS FOR EXISTING BUILDINGS
Universal Citation: MN Rules 7511.1027
Current through Register Vol. 49, No. 13, September 23, 2024
IFC Section 1027 is deleted in its entirety and replaced with the following:
SECTION 1027
MEANS OF EGRESS FOR EXISTING BUILDINGS
1027.1 General. Means of egress in existing buildings shall comply with Sections 1027.1 through 1027.23.4.
1027.1.1
Compliance option.
Means of egress in existing buildings conforming to NFPA 101 (Life Safety Code)
shall be deemed as evidence of compliance with this section.
1027.1.2
Previous codes. Means
of egress in existing buildings conforming to the requirements of the Fire Code
or Building Code under which they were constructed shall be considered as
complying means of egress if, in the opinion of the fire code official, they do
not constitute a distinct hazard to life.
1027.1.3
Occupant loads. The
number of occupants shall be determined in accordance with Section
1004.
1027.1.4
Egress
width. The minimum required egress width shall be determined in
accordance with Section 1005.1.
1027.1.5
Ceiling height. The
ceiling height in corridors and stairs shall be not less than 78 inches (1981
mm).
1027.2 Elevators, escalators and moving walks. Elevators, escalators and moving walks can only be used as a component of a required means of egress where previously approved.
1027.3 Exit signs - general. Exit signs shall comply with Sections 1027.3.1 through 1027.3.5.
1027.3.1
Where
required. Exits and exit access doors shall be marked by an approved
exit sign readily visible from any direction of egress travel.
1027.3.2
Number of exits. Exit
signs shall be provided where two or more exits are required from a room, area
or story.
1027.3.3
Main
exits. Exit signs need not be provided for main exterior exit doors that
are obviously and clearly identifiable as exits.
1027.3.4
Certain occupancies
exempt. Exit signs are not required in housing areas of Group I-3
occupancies; in sleeping rooms or dwelling units in Group R-1, R-2 or R-3
occupancies; and in Group U occupancies.
1027.3.5
Exit sign
illumination. Exit signs shall be internally illuminated, externally
illuminated or self-luminous. The face of an exit sign illuminated from an
external source shall have an intensity of not less than 5 foot-candles (54
lux). Internally illuminated signs shall provide equivalent luminance and be
listed for the purpose. Approved self-luminous signs that provide evenly
illuminated letters shall have a minimum luminance of 0.06 foot-lamberts (0.21
cd/m2).
1027.4 Power source. Where emergency illumination is required in Section 1027.5, exit signs shall be visible under emergency illumination conditions. Approved signs that provide continuous illumination independent of external power sources are not required to be connected to an emergency electrical system.
1027.5 Illumination - general. Normal and emergency illumination of the means of egress shall comply with Sections 1027.5.1 through 1027.5.3.
1027.5.1
Illumination required. The means of egress shall be illuminated
at all times the building space served by the means of egress is occupied.
Natural lighting in the interior rooms or spaces can be used to satisfy this
requirement during periods of daylight.
1027.5.1.1
Group U occupancies.
Illumination is not required in Group U occupancies.
1027.5.1.2
Aisle accessways.
Illumination is not required for aisle accessways.
1027.5.1.3
Dwelling units and sleeping
rooms. Illumination is not required for dwelling units and sleeping
rooms of Group I, R-1, R-2, and R-3 occupancies.
1027.5.2
Illumination level.
Floors and other walking surfaces within the means of egress shall be
illuminated as follows:
1027.5.2.1
General. The means of egress illumination level shall not be less than
one foot-candle (11 lux) at the floor level.
1027.5.2.2
Assembly
performances. In assembly occupancies, the illumination of the floors of
exit access shall be at least 0.2 foot-candle (2.2 lux) during periods of
performances or projections involving directed light.
1027.5.3
Illumination emergency
power. The power supply for means of egress illumination shall normally
be provided by the premises' electrical supply. In the event of power supply
failure, illumination shall be automatically provided from an emergency system
for the following occupancies where such occupancies require two or more means
of egress:
1. Group A having more than 50
occupants. Assembly occupancies used exclusively as a place of worship and
having an occupant load of less than 300 are not required to have emergency
illumination.
2. Group B buildings
three or more stories in height, buildings with 100 or more occupants above or
below the level of exit discharge, or buildings with 1,000 or more total
occupants.
3. Group E in interior
stairs, corridors, windowless areas with student occupancy, shops, and
laboratories.
4. Group F having
more than 100 occupants. Buildings used only during daylight hours that are
provided with windows for natural light are not required to have emergency
illumination.
5. Group I.
6. Group M buildings greater than 3,000
square feet (2879 m2) in gross sales area or
exceeding one story in height.
7.
Group R-1. Where each guest room has direct access to the outside of the
building at grade, emergency illumination is not required.
8. Group R-2. Where each living unit has
direct access to the outside of the building at grade, emergency illumination
is not required.
9. Group R-4.
Where each sleeping room has direct access to the outside of the building at
ground level, emergency illumination is not required.
The emergency power system shall provide power for not less than 30 minutes and consist of storage batteries, unit equipment or an onsite generator. The installation of the emergency power system shall be in accordance with Section 604.
1027.6 Guards. Guards complying with this section shall be provided at the open sides of means of egress that are more than 30 inches (762 mm) above the floor or grade below.
1027.6.1
Height of guards.
Guards shall form a protective barrier not less than 42 inches (1067 mm) high
except for the following existing guards:
1.
Existing guards on the open side of stairs, which are permitted to be not less
than 30 inches (760 mm) high.
2.
Existing guards within dwelling units, which are permitted to be not less than
36 inches (910 mm) high.
3.
Existing guards in assembly areas.
4. Existing guards on stairs and balconies of
buildings designated as historic structures, which are permitted to be not less
than 24 inches (610 mm) high.
1027.6.2
Opening limitations.
Open guards shall have balusters or ornamental patterns such that a 6-inch (152
mm) diameter sphere cannot pass through any opening up to a height of 34 inches
(864 mm) except when one of the following conditions exist:
1. At elevated walking surfaces for access to
and use of electrical, mechanical or plumbing systems or equipment, guards
shall have balusters or be of solid materials such that a sphere with a
diameter of 21 inches (533 mm) cannot pass through any opening.
2. In occupancies in Group I-3, F, H, or S,
the clear distance between intermediate rails measured at right angles to the
rails shall not exceed 21 inches (533 mm).
3. Approved existing open guards.
1027.7 Doors - general. Except where modified by Section 1008.1.2, doors shall be of the side-hinged swing type. Doors shall swing in the direction of egress travel where serving an occupant load of 50 or more persons. The minimum width of each door opening shall be sufficient for the occupant load thereof. Locks and latches shall comply with Sections 1008.1.8 and 1008.1.9.
1027.7.1
Size of doors. Except
where modified by this section, each required means of egress door shall comply
with the minimum dimensions specified herein. Doors shall provide a clear width
of not less than 28 inches (711 mm). Where this section requires a minimum
clear width of 28 inches (711 mm) and a door opening includes two door leaves
without a mullion, one leaf shall provide a clear opening width of 28 inches
(711 mm). The maximum width of a swinging door leaf shall be 48 inches (1219
mm) nominal. The height of doors shall not be less than 80 inches (2032 mm).
1027.7.1.1
Closets. Door
openings to storage closets less than 10 square feet (0.93
m2) in area shall not be limited by the minimum
width.
1027.7.1.2
Revolving
doors. Width of door leafs in revolving doors shall not be
limited.
1027.7.1.3
Dwelling
units. Door openings within a dwelling unit are permitted to be 78
inches (1981 mm) in height.
1027.7.1.4
Small rooms. Exit
access doors serving a room not larger than 70 square feet (6.5
m2) are permitted to be 24 inches (610 mm) in door
width.
1027.7.1.5
Health
care facilities. The minimum clear width for doors in the means of
egress from hospitals; nursing homes; limited care facilities; psychiatric
hospital sleeping rooms; and diagnostic and treatment areas, such as x-ray,
surgery, or physical therapy, shall be not less than 32 inches (810 mm) wide.
Existing 34-inch (865 mm) doors shall be permitted. Existing 28-inch (710 mm)
corridor doors in facilities where the fire plans do not require evacuation by
bed, gurney, or wheelchair shall be permitted.
1027.8 Opening force for doors. The opening force for interior side swinging doors without closers shall not exceed a 5-pound (22 N) force. For other side swinging, sliding and folding doors, the door latch shall release when subjected to a force of not more than 15 pounds (66 N). The door shall be set in motion when subjected to a force not exceeding a 30-pound (133 N) force. The door shall swing to a full-open position when subjected to a force of not more than 50 pounds (222 N). Forces shall be applied to the latch side.
1027.9 Revolving doors. Revolving doors shall comply with Sections 1027.9.1 through 1027.9.6.
1027.9.1
Location. A revolving
door shall not be located within 10 feet (3048 mm) of the foot or top of stairs
or escalators. A dispersal area shall be provided between the stairs or
escalators and the revolving doors.
1027.9.2
Speed. The revolutions
per minute for a revolving door shall not exceed those shown in Table
1027.9.
1027.9.3
Side-hinged
door required. Each revolving door shall have a conforming side-hinged
swinging door in the same wall as the revolving door and within 10 feet (3048
mm).
1027.9.4
Elevator
lobbies. A revolving door is permitted to be used without an adjacent
swinging door for street floor elevator lobbies provided a stairway, escalator
or door from other parts of the building does not discharge through the lobby
and the lobby does not have any occupancy or use other than as a means of
travel between elevators and a street.
1027.9.5
Side-hinged door
option. The requirement for a side-hinged swinging door shall not apply
where the number of revolving doors does not exceed the number of swinging
doors within 20 feet (6096 mm).
1027.9.6
Egress component. A
revolving door used as a component of a means of egress shall comply with
Section 1027.9 and all of the following conditions:
1. Revolving doors shall not be given credit
for more than 50 percent of the required egress capacity.
2. Each revolving door shall be credited with
not more than a 50-person capacity.
3. Revolving doors shall be capable of being
collapsed when a force of not more than 130 pounds (578 N) is applied within 3
inches (76 mm) of the outer edge of a wing.
TABLE 1027.9
REVOLVING DOOR SPEEDS
| Inside Diameter | Power-Driven-Type Speed Control (RPM) | Manual-Type Speed Control (RPM) |
| 6'6" | 11 | 12 |
| 7'0" | 10 | 11 |
| 7'6" | 9 | 11 |
| 8'0" | 9 | 10 |
| 8'6" | 8 | 9 |
| 9'0" | 8 | 9 |
| 9'6" | 7 | 8 |
| 10'0" | 7 | 8 |
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm.
1027.10
Stair dimensions
for existing stairs. Existing stairs in buildings shall be permitted to
remain if the rise does not exceed 8.25 inches (210 mm) and the run is not less
than nine inches (229 mm). Existing stairs are permitted to have a minimum
width of 36 inches (914 mm) but not less than the width required for the number
of occupants served as determined by Section 1005.1. Existing stairs can be
rebuilt.
1027.10.1
Stair dimensions
for replacement stairs. The replacement of an existing stairway in a
structure shall not be required to comply with the new stairway requirements of
Section 1009 where the existing space and construction will not allow a
reduction in pitch or slope.
1027.11
Winders. Existing
winders shall be allowed to remain in use if they have a minimum tread depth of
6 inches (152 mm) and a minimum tread depth of 9 inches (229 mm) at a point 12
inches (305 mm) from the narrowest edge.
1027.12
Circular stairways.
Existing circular stairs shall be allowed to continue in use provided the
minimum depth of tread is 10 inches (254 mm) and the smallest radius shall not
be less than twice the width of the stairway.
1027.13
Stairway handrails.
Stairways shall have handrails on at least one side. Handrails shall be located
so that all portions of the stairway width required for egress capacity are
within 44 inches (1118 mm) of a handrail. Aisle stairs provided with a center
handrail are not required to have additional handrails.
1027.13.1
Height. Handrail
height, measured above stair tread nosings, shall be uniform, not less than 30
inches (762 mm) and not more than 42 inches (1067 mm).
1027.14
Slope of ramps. Ramp
runs utilized as part of a means of egress shall have a running slope not
steeper than one unit vertical in ten units horizontal (ten percent slope). The
slope of other ramps shall not be steeper than one unit vertical in eight units
horizontal (12.5 percent slope).
1027.15
Width of ramps.
Existing ramps are permitted to have a minimum width of 30 inches (762 mm) but
not less than the width required for the number of occupants served as
determined by Section 1005.1.
1027.16
Fire escape stairs.
Fire escape stairs shall comply with Sections 1027.16.1 through 1027.16.7.
1027.16.1
Existing means of
egress. Fire escape stairs shall be permitted in existing buildings but
shall not constitute more than 50 percent of the required exit
capacity.
1027.16.2
Protection of openings. Openings within 10 feet (3048 mm) of fire escape
stairs shall be protected by fire assemblies having a minimum 3/4-hour
fire-resistance rating. In buildings equipped throughout with an approved
automatic sprinkler system, opening protection is not required.
1027.16.3
Dimensions. Fire
escape stairs shall meet the minimum width, capacity, riser height, and tread
depth as specified in Table 1027.16.
1027.16.4
Access. Access to a
fire escape from a corridor shall not be through an intervening room. Access to
a fire escape stair shall be from a door or window meeting the criteria of
Table 1005.1. Access to a fire escape stair shall be directly to a balcony,
landing, or platform. These shall be no higher than the floor or windowsill
level and no lower than 8 inches (203 mm) below the floor level or 18 inches
(457 mm) below the windowsill.
1027.16.5
Materials and
strength. Components of fire escape stairs shall be constructed of
noncombustible materials.
Fire escape stairs and balconies shall support the dead load plus a live load of not less than 100 pounds per square foot (4.78 kN/m2). Fire escape stairs and balconies shall be provided with a top and intermediate handrail on each side.
The fire code official is authorized to require testing or other satisfactory evidence that an existing fire escape stair meets the requirements of this section.
1027.16.6
Termination. The
lowest balcony shall not be more than 18 feet (5486 mm) from the ground. Fire
escape stairs shall extend to the ground or be provided with counter-balanced
stairs reaching the ground. For fire escape stairs serving ten or fewer
occupants, an approved fire escape ladder is allowed to serve as the
termination for fire escape stairs.
1027.16.7
Maintenance. Fire
escapes shall be kept clear and unobstructed at all times and shall be
maintained in good working order.
TABLE 1027.16
DIMENSIONS FOR EXISTING FIRE ESCAPE STAIRS
| Features | Serving More Than 10 Occupants | Serving 10 or Fewer Occupants |
| Minimum Width | 22 inches | 18 inches |
| Maximum Height of Risers | 9 inches | 12 inches |
| Minimum Tread Depth | 9 inches | 6 inches |
1027.17
Corridors. Corridors
and the openings therein shall provide an effective barrier to resist the
movement of smoke. Corridors, common path of travel, and travel distance shall
comply with Sections 1027.17.1 through 1027.17.6. Corridors complying with
Section 1017.1 need not be fire-resistance rated.
1027.17.1
Construction.
Corridors shall be fire-resistance rated in accordance with this section and
Table 1027.17.1. Existing walls surfaced with wood lath and plaster in good
condition or 1/2-inch gypsum wallboard are acceptable for corridor walls and
ceilings. Where Table 1027.17.1 allows a sprinkler system in lieu of
fire-resistance-rated construction, the building shall be protected throughout
with an automatic sprinkler system in accordance with Section 903.3.1.1 or
903.3.1.2 (where allowed).
1027.17.1.1
Existing churches. In Group A occupancies used as churches, existing
corridor walls, ceilings and opening protection not in compliance with Section
1027.17.1 may be continued when such buildings are protected with an approved
automatic fire alarm system. The fire alarm system shall include automatic
smoke detection throughout the exit system and approved detection in all boiler
rooms, furnace rooms, mechanical rooms, and storage rooms.
1027.17.1.2
Existing Group B
occupancies. In office areas of Group B occupancies not exceeding 10,000
square feet (929 m2) in size, existing corridor
walls, ceilings and opening protection not in compliance with Section 1027.17.1
may be continued when such buildings are protected with an approved automatic
fire alarm system. The fire alarm system shall include automatic smoke
detection throughout the exit system and approved detection in all boiler
rooms, furnace rooms, mechanical rooms and storage rooms.
1027.17.1.3
Existing Group E
occupancies. In Group E occupancies, existing corridor walls, ceilings
and opening protection not in compliance with Section 1027.17.1 may be
continued when such buildings are protected with an approved automatic fire
alarm system that is monitored by a central, proprietary or remote station
service. The fire alarm system shall include automatic smoke detection
throughout the exit system and approved detection in all rooms and areas other
than classrooms and offices.
TABLE 1027.17.1
CORRIDOR FIRE-RESISTANCE RATING
| Required Fire-Resistance Rating (hours) | |||
| Occupancy | Occupant Load Served by Corridor | Without Sprinkler System | With Sprinkler System |
| A,B,E,F,H, M,S,U | Greater than 30 | 1 | 0 |
| I | Greater than 10 | 1 (see Section 1027.17.2.3) | 0 |
| R | Greater than 10 | 1 | 0 |
1027.17.2
Corridor openings.
Openings into corridors shall comply with Sections 1027.17.2.1 through
1027.17.2.3.
1027.17.2.1
Doors.
Doors opening into corridors required by Table 1027.17.1 to be fire-resistance
rated shall be protected by 20-minute fire assemblies or solid wood doors not
less than 1-3/4 inches (45 mm) thick. Where the existing frame will not
accommodate the 1-3/4 inches (45 mm) thick door, a 1-3/8 inches (35 mm) thick
solid bonded wood core door or equivalent insulated steel door shall be
permitted. Doors shall be self-closing or automatic-closing by smoke
detection.
1027.17.2.2
Other
openings. Openings with fixed wired glass set in steel frames are
permitted for corridor walls and ceilings. Transoms, louvers and openings other
than doors from corridors to rooms shall be automatic-closing by smoke
detection or shall be covered with a minimum of three-quarter inch (19 mm)
gypsum wallboard or equivalent material on the room side.
1027.17.2.3
Existing Group I-2 and I-3
occupancies. Patient room doors in corridors in Group I-2 occupancies
and Group I-3 corridor doors need not be fire-resistance rated or self-closing
where smoke barriers are provided in accordance with the Building Code or NFPA
101.
1027.17.3
Corridor width. The minimum corridor width shall be in accordance with
Sections 1027.17.3.1 through 1027.17.3.2.
1027.17.3.1
Minimum width. The
minimum corridor width shall be as determined by the occupant load calculations
in Section 1005.1, but not less than 36 inches.
1027.17.3.2
Minimum width in
mechanical areas. The minimum corridor width is allowed to be reduced to
24 inches (610 mm) for spaces providing access to electrical, mechanical or
plumbing systems.
1027.17.4
Dead ends. Where more
than one exit or exit access doorway is required, the exit access shall be
arranged such that dead ends do not exceed the limits specified in Sections
1027.17.4.1 through 1027.17.4.2 and Table 1027.17.4.
1027.17.4.1
Wide corridors and
dead-end provisions. A dead-end passageway or corridor shall not be
limited in length where the length of the dead-end passageway or corridor is
less and 2.5 times the least width of the dead-end passageway or
corridor.
1027.17.4.2
Existing Group E corridors. In Group E occupancies constructed prior to
October 3, 1975, dead ends of up to 35 feet (10 668 mm) in length are allowed,
provided the building is protected with an approved automatic sprinkler system
throughout.
TABLE 1027.17.4
COMMON PATH, DEAD-END, AND TRAVEL DISTANCE LIMITS
(by occupancy)
| Occupancy | Common Path Limit | Dead-end Corridor Limit | Travel Distance Limit | |||
| Unspr (feet) | Spr (feet) | Unspr (feet) | Spr (feet) | Unspr (feet) | Spr (feet) | |
| Group A | 20/75a | 20/75a | 20b | 20b | 200 | 250 |
| Group B | 75 | 100 | 50 | 50 | 200 | 300 |
| Group E | 75 | 75 | 20 | 20 | 200 | 250 |
| Groups F-1, S-1d | 75 | 100 | 50 | 50 | 200 | 250 |
| Groups F-2, S-2d | 75 | 100 | 50 | 50 | 300 | 400 |
| Group H-1 | 25 | 25 | 0 | 0 | 75 | 75 |
| Group H-2 | 50 | 100 | 0 | 0 | 75 | 100 |
| Group H-3 | 50 | 100 | 20 | 20 | 100 | 150 |
| Group H-4 | 75 | 75 | 20 | 20 | 150 | 175 |
| Group H-5 | 75 | 75 | 20 | 50 | 150 | 200 |
| Group I-1 | 75 | 75 | 20 | 20 | 200 | 250 |
| Group I-2 (Health Care) | N/R | N/R | N/R | N/R | 150 | 200c |
| Group I-3 | 100 | 100 | N/R | N/R | 150c | 200c |
| Group I-4 (Day Care) | N/R | N/R | 20 | 20 | 200 | 250 |
| Group M (Covered Mall) | 75 | 100 | 50 | 50 | 200 | 400 |
| Group M (Mercantile) | 75 | 100 | 50 | 50 | 200 | 250 |
| Group R-1 (Hotels) | 75 | 75 | 50 | 50 | 200 | 250 |
| Group R-2 (Apartments) | 75 | 75 | 50 | 50 | 200 | 250 |
| Groups R-3, R-4 | N/R | N/R | N/R | N/R | N/R | N/R |
| Group U | 75 | 75 | 20 | 20 | 200 | 400 |
"Unspr" means unsprinklered and "Spr" means sprinklered.
For SI: 1 foot = 304.8 mm.
a. 20 feet for common path serving more than
50 persons; 75 feet for common path serving 50 or fewer persons.
b. See Section 1024.9.5 for dead-end aisles
in Group A occupancies.
c. This
dimension is for the total travel distance, assuming incremental portions have
fully utilized their allowable maximums. For travel distance within the room,
and from the room exit access door to the exit, see the appropriate occupancy
chapter.
d. See the International
Building Code for special requirements on spacing of doors in aircraft hangers.
N/R = No requirements.
1027.18
Exit access travel
distance. Exits shall be located so that the maximum length of exit
access travel, measured from the most remote point to an approved exterior
exit, vertical exit enclosure, horizontal exit, or exit passageway along the
natural and unobstructed path of egress travel, does not exceed the distances
given in Table 1027.17.4.
1027.19
Common path of egress travel. The common path of egress travel
shall not exceed the distances given in Table 1027.17.4.
1027.20
Stairway discharge
identification. A stairway in an exit enclosure that continues below the
level of exit discharge shall be arranged and marked to make the direction of
egress to a public way readily identifiable. Stairs that continue one-half
story beyond the level of exit discharge need not be provided with barriers
where the exit discharge is obvious.
1027.20.1
Exterior stairway protection. Exterior exit stairs shall be
separated from the interior of the building as required in Section
1023.6.
1027.21
Minimum aisle width. The minimum clear width of aisles and aisle
accessways shall be in accordance with this section and Table 1027.21.
1027.21.1
Aisle and aisle accessway
width. Aisles and aisle accessway widths shall be as determined by the
occupant load calculations in Section 1005.1, but not less than the widths
shown in Table 1027.21.
1027.21.2
Aisle accessway width for table and chair seating. Aisle
accessway width for the table and chair seating (distance between two rows of
seats) shall comply with Section 1014.4.1.
TABLE 1027.21
MINIMUM AISLE AND AISLE ACCESSWAY WIDTHS
| Condition | Minimum width (in inches) |
| Aisle accessways serving seating areas having 50 or fewer seats, tables, or desks | 24 inches (610 mm) |
| Aisle accessways serving seating areas having more than 50 seats, tables, or desks | 30 inches (760 mm) |
| Aisle accessways serving employee areas only | 24 inches (610 mm) |
| Level or ramped aisles having seating on each side and serving 50 or fewer seats | 36 inches (914 mm) |
| Level or ramped aisles having seating on each side and serving more than 50 seats | 42 inches (1067 mm) |
| Level or ramped aisles having seating on one side and serving 60 or fewer seats | 30 inches (760 mm) |
| Level or ramped aisles having seating on one side and serving more than 60 seats | 36 inches (914 mm) |
| Aisle stairs having seating on each side and serving 50 or fewer seats | 36 inches (914 mm) |
| Aisle stairs having seating on each side and serving more than 50 seats | 42 inches (1067 mm) |
| Aisle stairs having seating on one side and serving 60 or fewer seats | 30 inches (760 mm) |
| Aisle stairs having seating on one side and serving more than 60 seats | 36 inches (914 mm) |
| Aisle stair - distance between seating and aisle handrail or guard when the aisle is subdivided | 20 inches (508 mm) |
1027.22
Stairway floor number
signs. Existing stairs shall be marked in accordance with Section
1020.1.7.
1027.23
Number of
means of egress or exits. The number of means of egress doors or exits
from a room, area, story or building shall be in accordance with Sections
1027.23.1 through 1027.23.4 and Table 1027.23.
1027.23.1
Number based on
capacity. Two means of egress doors or exits are required from rooms,
areas, stories or buildings when the number of occupants exceeds the values
shown in Table 1027.23.
1027.23.2
Three egress doors on exits required. Three means of egress doors
or exits are required from rooms, areas, stories or buildings when the number
of occupants exceeds 501 persons.
1027.23.3
Four egress doors or exits
required. Four means of egress doors or exits are required from rooms,
areas, stories or buildings when the number of occupants is 1001 or more
persons.
1027.23.4
Group E
laboratories. Group E science laboratories containing hazardous
materials shall have two exits when exceeding 1,000 square feet (93
m2) in size.
TABLE 1027.23
TWO EGRESS DOORS OR EXITS REQUIRED
| Occupancy | Number of Occupants |
| A,B,E,F,M,S,U | 50 Occupants |
| H,I,R | 10 Occupants |
Statutory Authority: MS s 299F.011
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