Abilities
* Able to be instal on all revoled air – distributed system as ventilator , air – washers . …
* Able to be made according to the order .
* Usable by stone wool with varide densite to absorb noise .
* Low pressure Decrease
* to be resist on the fire .
* Easy to be instaled .         
Use cases  
* suitable for desired ventilation industry to absorb noise in air – duct in studio , Amphy  the athers , conference saloons , hospitals , official places.
* Agostic hn major and minor ducts in air traffic direction Use.