A room in a tenement, lodging or boarding house shall not be used as a sleeping room unless it has an outside window or is provided with a sash window of at least eight square feet opening into an adjoining room, in the same apartment, having an outside window, which sash window shall be a vertically sliding, pulley-hung sash, both halves of which shall be so constructed as to open readily, and the lower half shall be glazed with translucent glass.
(P.A. 79-571, S. 79.)