Illinois Society of Architects · Chicago · leaf 195
ses, in lieu of such window or windows, may be ventilated by an approved mechani-cal ventilation system which shall effect atleast six complete changes of air per hour,(d) In every building hereafter erectedfor or converted to office, hotel or club pur-poses, every room, except a room used as… … E LEVATION
Architecture · Building · Architects
Internet Archive · University of Illinois Urbana-Champaign · Public Domain Mark 1.0. Free to use for anything.
