... absorbing high and middle frequency noises.2. Artistic products—natural wood, which may be carved according to your taste.3. ... 4. Fire-proofing—fire-proofing degree B1—the highest for wood. It has already been tested by authoritative organization. 5. ... TV station, library, theater, opera house, hotel, meeting room, computer machine room, researching lab, factory shop, gym, school etc. all these ...