§ 217. Lighting and ventilation of public halls and stairs. 1. In\nevery tenement erected after April twelfth, nineteen hundred one, which\nexceeds four stories in height or is occupied by three families or more\non any story, every public hall shall have at least one window opening\ndirectly upon a street, yard or court. Such window shall be located at\nthe end of the hall and at right angles to its length, with an\nadditional window in each thirty feet of hall or fraction thereof beyond\nthe first sixty feet from such end window if the tenement was erected\nafter April eighteenth, nineteen hundred twelve; or, if the window is\nnot thus located at the end of the hall, there shall be at least one\nwindow opening directly upon a street, yard or court in every twenty\nfeet of the length of the hall or fraction thereof, measured from one\nend of hall; but the foregoing provisions shall not apply to that\nportion of an entrance hall between the entrance and the first flight of\nstairs if the entrance door contains five square feet or more of glazed\nsurface.\n 2. When the length of any recess or return off of a public hall in\nsuch a tenement does not exceed twice its width, no window shall be\nrequired therein. But wherever the length of a recess or return exceeds\ntwice its width there shall be an additional window or windows meeting\nthe requirements for a separate public hall.\n 3. Except as provided in subdivision four, a tenement erected after\nApril twelfth, nineteen hundred one, which is four stories or less in\nheight and occupied by not more than two families on any story shall\neither have windows in its public halls as above provided or a stairwell\ntwelve inches or more in width extending from the entrance story to the\nroof. In such a tenement, except as provided in subdivision four, every\nentrance door shall contain five square feet or more of glazed surface,\nand all doors leading from the public halls shall be provided with\ntranslucent glass panels five square feet or more in area for each door\nand fixed transoms of translucent glass over each door.\n 4. Neither such windows nor such a stairwell shall be required in\ncities of one million or more population in tenements which do not\nexceed three stories in height or fifty-five feet in depth and which are\noccupied by not more than one family on any story and in which the\nstairs descend in a straight and continuous run from the top story to\nthe entrance story with proper landings at each story. Such tenements\nshall not be required to have glass panels or transoms in the doors\nleading from the public halls.\n 5. In every public hall that is provided with a window or windows in a\ntenement erected after April twelfth, nineteen hundred one, at least one\nsuch window shall be at least two feet six inches wide and five feet\nhigh.\n 6. In every such tenement there shall be provided, at every floor\nlevel, a window opening upon a street, yard, court or space above a\nsetback to light and ventilate every stair. Every such required window\nshall be of the size required by subdivision five, except that a window\nopening upon a street need be only four feet high. On the top story a\nventilating skylight of the same dimensions shall be accepted in lieu of\na window for that story.\n 7. In every such tenement there shall be in the roof, directly over\neach stairwell, a ventilating skylight provided with ridge ventilators\nhaving an opening of at least forty square inches, or provided with\nfixed or movable louvres. The roof of every such skylight shall have at\nleast twenty square feet of glazed surface. If the stairs and public\nhalls are not provided at each story with windows opening directly to\nthe outer air, the skylights shall be provided with ridge ventilators\nand also with fixed or movable louvres or movable sashes.\n 8. A sash door shall be deemed the equivalent of a window for the\npurposes of this section if it contains the amount of glazed surface
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