Running an efficient business, school, or government office requires minimizing distractions, and one of the most common problems is noise pollution. This is particularly true for buildings located close to highways, airports, and railroad tracks, but any area where large amounts of people work together is going to frequently get noisy. There are also many places where soundproofing a room is important, such as recording studios, music rehearsal spaces, hotels, and conference rooms. Fortunately, installing Sound Transmission Control (STC) doors is a highly effective way to reduce excess noise, and create additional privacy for meetings where confidential information is being discussed.