Article 128Supplement v1, p. 128

COMMERCIAL LAWS SUPPLEMENT

Department as to installation and location and shall be

subject to such periodic test as it may require.

SECTION

1213.

Stages

and

Platform .

—

(a)

Stage

Ventilators — There shall be one or more ventilators

constructed of metal or other incombustible material

near the center and above the highest part of any

working stage raised above the stage roof and having a

total ventilation area equal to at least five percent of the

floor area within the stage walls. The entire equipment

shall conform to the following requirements:

(1) Opening Action — Ventilators shall open by spring

action or force of gravity sufficient to overcome the

effects of neglect, rust, dirt, or expansion by heat or

wrapping of the framework.

(2) Glass — Glass, if used in ventilators must be protected

against falling on the stage. A wire screen, if used under

the glass, must be so placed that if clogged it cannot

reduce the required ventilating area or interfere with the

operating mechanism or obstruct the distribution of

water from the automatic fire extinguishing systems.

(3) Design — Ventilators, penthouses, and supporting

framework shall be designed in accordance with this

Code.

(4)

Spring Actuation — Springs, when employed to

actuate ventilator doors, shall be capable of maintaining

full required tension indefinitely. Springs shall be not

stressed more than fifty percent of their rated capacity

and shall not be located directly in the air stream, nor

exposed to elements.

(5) Location of Fusible Links — A fusible link shall be

placed in the cable control system on the underside of

the ventilator at or above the roof line or as approved by

the Building Official, and shall be so located as not to be

affected by the operation of fire-extinguishing systems.

(6) Control — Remote, manual, or electrical control shall

provide for both opening and closing of the ventilator

doors for periodic testing and shall be located at a point

on the stage designated by the Building Official. When

remote control of ventilator is electrical, power failure

shall not affect its instant operation in the event of fire.

Hand winches may be employed to facilitate operation of

manually controlled ventilators.

(b) Gridirons — (1) Gridirons, fly galleries, and pin-rails shall

be

constructed

of

incombustible

materials

and

fire

protection of steel and iron may be omitted. Gridirons

and fly galleries shall be designed to support a live load of

not less than 367 kilograms per square meter. Each loft

block well shall be designed to support 373 kilograms per

linear meter and the head block well shall be designed to

support the aggregate weight of all the loft block wells

served. The head block well must be provided with an

adequate strengback or lateral brace to offset torque.

(2)

The

main

counterweight

sheave

beam

shall

be

designed to support a horizontal and vertical uniformly

distributed

live

load

sufficient to accommodate the

weight imposed by the total number of loft blocks in the

gridiron.

The

sheave

blocks

shall

be

designed

to

accommodate the maximum load for the loft or head

blocks served with a safety factor of five.

(c) Rooms Accessory to Stage — In a building having a

stage, the dressing room sections, workshops, and store

rooms

shall

be

located

on

the

stage

side

of

the

proscenium wall and shall be separated from each other

and from the stage by not less than a One-hour Fire

Resistive Occupancy Separation.

(d) Proscenium Walls — A stage shall be completely

separated from the auditorium by a proscenium wall or

not less than two-hour incombustible construction. The

proscenium wall shall extend not less than 1.20 meters

above the roof over the auditorium. Proscenium walls

may have the addition to the main proscenium openings,

one opening at the orchestra pit level and not more than

two openings at the stage floor level, each of which shall

be not more than 2.00 square meters in area. All openings

in the proscenium walls of stage shall be protected by a

fire assembly having a one and one-half fire-resistive

rating. The proscenium opening, which shall be the main

opening for viewing performances, shall be provided with

a self closing fire-resistive curtain as specified in this

Code.

(e) Stage Floor — The type of construction for storage

floors shall depend upon the requirements based on the

type of Occupancy and the corresponding fire-resistive

requirements.

All

parts

of

the

stage

floor

shall

be

designed to support not less than 620 kilograms per

square meters. Openings through stage floor shall be

equipped with tight-fitting trap doors of wood of not less

than 5 millimeters nominal thickness.

(f) Platforms — The type of construction for platforms

shall depend upon the requirements based on the type of

Occupancy

and

corresponding

fire-resistive

requirements. Enclosed platforms shall be provided with

one or more ventilators conforming to the requirements

of stage ventilators: Except , that the total area shall be

equal to five percent of the area of the platform. When

more than one ventilator is provided, they shall be so

spaced

as

to

provide

proper

exhaust

ventilation.

Ventilators shall not be required for enclosed platform

having a floor area of 45.00 square meters or less.

(g) Stage Exits — At least one exit not less than 900

millimeters wide shall be provided from each side of the

stage opening directly or by means of a passageway not

less than 900 millimeters in width to a street or exit court.

An exit stair not less than 750 millimeters wide shall be

provided for egress from each fly gallery. Each tier of

dressing rooms shall be provided with at least two means

of egress each not less than 750 millimeters wide and all

such stairs shall be constructed in accordance with the

requirement specified in this Code. The stairs required in

this subsection need not be enclosed.

SECTION 1214. Motion Picture Projection Rooms . — (a)

General — The provisions of this Section shall apply only

where ribbon type motion picture films in excess of

22-millimeters width and electric projection equipment

are used. Every motion picture machine using ribbon

type film in excess of 22 millimeter width and electric arc

projections

equipment,

together

with

all

electrical

devices, rheostats, machines, and all such films present in

any Group C, I, or H Occupancy, shall be enclosed in a

projection room large enough to permit the operator to

walk freely on either side and back of the machine.

(b) Construction — Every projection room shall be of not

less than one-hour fire-resistive construction throughout

and

the

walls

and

ceiling

shall

be

finished

with

incombustible materials. The ceiling shall not be less than

2.40 meters from the finished floor. The room shall have a

floor area of not less than 7.00 square meters and 3.50

square meters for each additional machine.

(c) Exit — Every projection room shall have at least two

doorways separated by not less than one-thirds the

perimeter of the room, each at least 750 millimeters wide

and 2.00 meters high. All entrances to a projection room

shall be protected by a self-closing fire assembly having a

three-fourths hour fire-resistive rating. Such doors shall

open outward and lead to proper exits as required in this

Code and shall not be equipped with any latch. The

maximum width of such door shall be 750 millimeters.

(d) Ports and Openings — Ports in projection room walls

shall be of three kinds: projection ports; observation ports;

and combination ports used for both observation and for

stereopticon, spot or floodlight machines.

(1) Ports Required — There shall be provided for each

motion picture projector not more than one projection

port,

which

shall

be limited in area to 750 square

centimeters, and not more than one observation port,

which shall be limited in area to 1,300 square centimeters.

There shall be not more than three combination ports,

each of which shall not exceed 750 millimeters by 600

millimeters.

Each

port

opening

shall

be

completely

covered with a pane of glass; Except, that when acetate

© Compiled by RGL

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