An air-conditioning system installed close to exterior walls in the neighbourhood is asking for problems. Or perhaps not! ATIS International ensured that 4 pieces of new condenser units were acoustically screened off. We constructed a Sonodamp sound absorbing screen and constructed silencers around each ventilator by means of Sonododamp sandwich panels. With demountable fronts, maintenance of the units is no obstacle at all. The result was that one particular resident wanted to know when the new installation would become operational. We informed him that the units had already been in operation for some time.