The VAL damper plenum box increases the terminal dampening of supply and exhaust air vents and limits the transfer of airborne sound from one room to another.
VAL is made of galvanised sheet steel and the dampening material is polyester wool (Dacron) that does not give fibres or particles in the air. VAL is delivered with insulated joint muffs.
VAL limits the transfer of airborne sound from one room to another.
Sound attenuation for air ducts between rooms Dn,e,wdB:
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