Section 27-757
§ 27-757 Rooms in institutional H-1 occupancy. In occupancy group H-1,
rooms or spaces in which persons are detained under restraint may be
naturally ventilated by means meeting the intent of this subchapter.
Section 27-758
§ 27-758 Kitchens. Kitchens shall be ventilated as follows: (a)
Kitchens located within dwelling units and having a floor area of
greater than fifty-nine square feet shall have natural ventilation as
prescribed in article six of this subchapter. When the floor area is
fifty-nine square feet or less, the kitchen shall be ventilated by
either of the following:
(1) Natural means complying with article six of this subchapter and
further that the windows shall have a minimum width of twelve inches, a
minimum area of thee square feet or ten per cent of the floor area of
the space whichever is greater and so constructed that at least one-half
of their required area may be opened. When the space is located at the
top story the window or windows may be replaced with a skylight whose
minimum width shall be twelve inches, whose minimum area shall be four
square feet or one-eighth the floor area of the space whichever is
greater and shall have ventilating openings of at least one-half of the
required area of the skylight.
(2) Mechanical means exhausting at least two cfm of air per square
foot of floor area. Where doors are used to separate the space the lower
portion of each door shall have a metal grille containing at least
forty-eight square inches of clean openings or in lieu of such grille
two clear open spaces may be provided, each of at least twenty-four
square inches, one between the bottom of each door and the floor and the
other between the top of each door and the head jamb.
(b) Kitchens, except those located within dwelling units, and side
spaces, where cooking of any kind is done, shall be ventilated by either
of the following; provided that in no instance may there be any
violation of the nuisance provisions of the health code.
(1) Natural means complying with article six of this subchapter and
supplemented with auxiliary mechanical supply and exhaust ventilation
adequate to remove the fumes and smoke from the cooking equipment when
operating.
(2) Mechanical means exhausting at least three cfm of air per square
foot of floor area, but in no case less than one hundred fifty cfm. Such
air shall be exhausted through duct or chimney constructed in accordance
with the provisions of subchapters thirteen through fifteen of this
chapter.
(c) Kitchens, snack bars, or pantries, where the operation consists of
heating or warming previously prepared food that was cooked elsewhere,
or preparation of food in vending machines may be ventilated by either
of the following:
(1) Natural ventilation complying with article six of this subchapter.
(2) Mechanical ventilation complying with article seven of this
subchapter.
Section 27-759
§ 27-759 Bathrooms and toilet rooms. Bathrooms and toilet rooms shall
be ventilated as follows:
(a) When ventilated by natural means, the natural ventilation sources
shall comply with section 27-749 of article six of this subchapter and
shall have an unobstructed free area of at least five per cent of the
floor area. In no case shall the net free area of the ventilation
sources be less than one and one-half square feet except that in
occupancy groups H-1 and H-2, provided the ventilation opening
conforming with section 27-749 of article six of this subchapter may be
in a vent shaft provided that the net free area of the opening is not
less than three square feet. The vent shaft cross-sectional area shall
be increased by one-fifth of a square foot for every foot of height, but
shall not be less than nine square feet in area and open to the outer
air at the top; or, the vent shaft may be open at the sides above the
roof, with louvres providing an equivalent net free area at the top,
equal to the area of the shaft.
(b) By individual vent shafts or ducts constructed of noncombustible
materials with a minimum cross-sectional area of one square foot and
one-third additional square foot for each additional water closet or
urinal above two in number. The upper termination of such ducts shall be
equipped with a wind-blown ventilator cap.
(c) When a bathroom or toilet room is not ventilated by natural
ventilation as required by this section, it shall be mechanically
ventilated as follows:
(1) Rooms containing only one water closet or urinal shall be
mechanically ventilated by an exhaust system capable of exhausting at
least fifty cubic feet of air per minute. Means shall be provided for
air ingress by louvres in the door, by undercutting the door, or by
transfer ducts, grilles, or other openings.
(2) Rooms containing more than one water closet or urinal, and any
auxiliary spaces such as those used in hand basins, slop sinks, and
locker rooms, shall be mechanically ventilated by an independent exhaust
system capable of exhausting at least forty cubic feet of air per minute
per water closet or urinal. The outdoor air supply shall conform to the
requirements of article seven of this subchapter.
(3) Toilet exhaust systems shall be arranged to expel air directly to
the outdoors.
Section 27-760
§ 27-760 Inside locker rooms. Inside locker rooms and dressing rooms
for more than one person shall be provided with exhaust ventilation
giving at least four changes of air per hour.
Section 27-761
§ 27-761 Corridors. Unless natural sources complying with section
27-749 of article six of this subchapter provides ventilating openings
equivalent to at least two and one-half percent of the floor area,
corridors in buildings of occupancy groups H-1, J-1 and J-2 more than
three stories in height, shall be mechanically ventilated by a system
supplying at least one-half cubic foot of outdoor air per minute per
square foot of floor area. When air conditioned, a part of the required
supply may be recirculated as equivalent outdoor air, but at least
thirty-three and one-third percent of the required air supply shall be
actual outdoor air.
Section 27-762
§ 27-762 Crawl spaces. (a) Buildings and structures without basements.
In buildings and structures constructed without basements, and in which
the first floor construction does not bear directly on the ground, a
space at least eighteen inches high shall be provided directly under the
floor beams, girders or sill of the first floor construction. Where the
floor above such a space is constructed of wood or metal, the space
shall be ventilated by one of the following means:
(1) At least four widely-distributed ventilating openings, providing a
total net free area of at least one eight-hundredth of the area of the
crawl space, shall be provided in the foundation walls, and the ground
within the crawl space shall be covered with a vapor barrier in
durability equivalent to at least fifty-five pounds, roofing felt with
unsealed laps and with a transmission rate of one perm or less. At least
two ventilating openings, providing a total net free area of at least
one fifteen-hundredth the area of the crawl space shall be provided in
foundation walls, provided that a vapor barrier with a transmission rate
of one perm or less is installed over the entire underside of the first
floor construction and overlaps the walls.
(2) Other means acceptable to the commissioner.
(b) Buildings and structures with basements. No foundation wall vents
shall be required where one side of a crawl space is completely open
except for structural members, to a basement that has an area at least
equivalent to that of the crawl space, provided that the basement is
naturally ventilated by openings complying with section 27-749 of
article six of this subchapter and having a free openable area of at
least five per cent of the floor area of the basement.
Section 27-763
§ 27-763 Ventilation of refrigeration plants. Rooms containing
refrigeration plants shall be ventilated in accordance with the
provisions of subchapter thirteen of this chapter.
Section 27-764
§ 27-764 Ventilation of boiler rooms. Boiler rooms shall be ventilated
in a manner that will provide air for combustion in accordance with the
provisions of subchapter fourteen of this chapter and also prevent the
accumulation of hot air over or near the equipment within the room.
Section 27-765
§ 27-765 Ventilation for schools. School buildings shall be ventilated
in accordance with the following requirements:
(a) Rooms of instruction and administration. Classrooms, other rooms
of instruction, and administrative rooms, where the index for
ventilation is less than one thousand six hundred fifty, shall have a
supply of outdoor air of at least fifteen cfm per occupant and
mechanical exhaust. Where windows are used as the source of supply air,
mechanical air exhaust shall be fifteen cfm per occupant. When outdoor
air is supplied by mechanical means, the exhaust shall be at least
eighty per cent of the supply. In air-conditioned rooms, the conditioned
air supply may be reduced to a minimum of ten cfm per occupant, of which
at least five cfm shall be outdoor air.
(b) Lockers and wardrobes. Lockers, wardrobes, or wardrobe rooms shall
be ventilated in accordance with the provisions of section 27-760 of
this article, and where these spaces are located within or adjacent to
classroom, the exhaust air from the classroom may be used for such
ventilation.
(c) Auditoria and assembly rooms. Rooms where there are more than
seventy-five occupants shall have a supply of outdoor air of at least
fifteen cfm per occupant and mechanical exhaust. Where windows are used
as the source of supply air, mechanical air exhaust shall be at least
fifteen cfm per occupant. When outdoor air is supplied by mechanical
means, the mechanical exhaust shall be at least eighty per cent of the
supply. In air-conditioning spaces, the conditioned air supply may be
reduced to a minimum of ten cfm per occupant, of which at least five cfm
shall be outdoor air.
Section 27-766
§ 27-766 Ventilation of rooms or spaces with excessive temperatures,
strong odors, toxic substances, or airborne irritants. In these rooms or
spaces, prevention of all of the following conditions shall be
considered in the design and installation of a ventilating system:
(a) Excessive temperatures that may be detrimental to the occupants.
(b) The danger of large concentrations of toxic substances in the air.
(c) The danger of large concentrations of airborne irritants an
impurities, such as steam, gases, vapor, and dust, that may be injurious
to health.
Where the exhausted air may contain toxic substances or strong
objectional odors, the exhaust system shall be independent of exhaust
systems serving other parts of the building.
Section 27-767
§ 27-767 Ventilation for special uses and occupancies. Special uses
and occupancies, not provided for in this subchapter, shall be
ventilated in accordance with the requirements of subchapter seven of
this chapter. Ventilation of stage areas shall be in accordance with
the requirements of subchapter eight of this chapter.
To the extent possible under law, Friends of Devin Balkind for Public Advocate has waived all copyright and related or neighboring rights to New York City Administrative Code. This work is published from: United States.
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