The casing and blades of VAV devices are made from galvanized sheet metal and blade seal is provided for by using silicone gaskets. VAV devices consist of a rectangular casing with a round input neck and an attenuator made from galvanized sheet metal an. The attenuators ﬁlling material consists of rock wool plates with a density of 70 kg/m3.
Used for blowing and suction ducts. High speed or variable ﬂow rate applications It has been designed. VAV application made in places where ﬂow control unnecessary for the operation of the system prevented energy savings. Optionally manufactured as attenuators VAV devices which may be according to usage It can also be made electrically heated.