Insulation is very
important in a HVAC system. One use the material to insulate hot and cold air
systems, copper tubes in airco systems or to give an acoustic insulation . The
most common insulation for air duct work are rolls or plates of glass wool,
stone wool or synthetic rubber. Circular ducts can be insulated with a
insulating sleeve from glass fibre. In many cases the plenum boxes of the air
diffusers are insulated to reduce the noice towards the air
terminal.