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  2. Perforated metal - Wikipedia

    en.wikipedia.org/wiki/Perforated_metal

    Studies have shown that perforated metals help reduce sound levels. [4] Studies have shown that having buildings use perforated metal sheets in front of their façade can bring in one study 29% energy savings (HVAC + Lighting estimated consumption in 1 year) and in the second one 45% energy savings (heating, ventilation, air conditioning).

  3. Marston Mat - Wikipedia

    en.wikipedia.org/wiki/Marston_mat

    RAF aircrew with one of their Bristol Beaufighters on a PSP airstrip at Biferno, Italy, August 1944. Marston Mat, more properly called pierced (or perforated) steel planking (PSP), is standardized, perforated steel matting material developed by the United States at the Waterways Experiment Station shortly before World War II, primarily for the rapid construction of temporary runways and ...

  4. Mashrabiya - Wikipedia

    en.wikipedia.org/wiki/Mashrabiya

    Theory. Arabic maqam; Arab tone system; Algerian scale; Rhythm in Arabic music; Taqsim; Jins; Lazma; Teslim; Quarter tone; Arabic musical instruments; Great Book of Music

  5. Micro perforated plate - Wikipedia

    en.wikipedia.org/wiki/Micro_perforated_plate

    A micro perforated plate (MPP) is a device used to absorb sound, reducing its intensity. It consists of a thin flat plate, made from one of several different materials, with small holes punched in it. An MPP offers an alternative to traditional sound absorbers made from porous materials.