§ 280. Water-closets and bathrooms. The requirements for water-closet
compartments, bath and shower rooms shall be the same as provided in
section two hundred fifteen for fireproof dwellings, except that each
required water-closet compartment, bath or shower room in an apartment
shall be ventilated by a window opening to the outer air as provided in
section one hundred seventy-one. Water-closet compartments, bath and
shower rooms which are supplementary to those required under the
provisions of sections one hundred seventy-one and two hundred fifteen
may be mechanically or gravity ventilated as provided in section one
hundred seventy-one.