Glossary

A fire sprinkler (head) of special design, intended for installation in ceilings; includes sprinklers of the recessed, flush, and concealed

A single-number rating of the soundinsulating value of a suspended ceiling between adjacent rooms.

In a suspended ceiling construction, the transmission of sound between adjoining rooms by way of the path consisting of the

The systematic destruction of a building, all or in part.

A study of the size, distribution, and composition of, and changes within, a specified population group.

Any wall that separates one tenants space from that of another tenant.