<P> A purely utilitarian use of vestibules in modern buildings is to create an `` air lock '' entry . Such vestibules consist of merely a set of inner doors and a set of outer doors , the intent being to reduce air infiltration to the building by having only one set of doors open at any given time . </P>
<P> A purely utilitarian use of vestibules in modern buildings is to create an `` air lock '' entry . Such vestibules consist of merely a set of inner doors and a set of outer doors , the intent being to reduce air infiltration to the building by having only one set of doors open at any given time . </P>
what is the space between two sets of doors called
what is the space between two sets of doors called
vestibules
vestibules