Air conditioning silencer and method of silencing an air conditioning unit

摘要

An air conditioning silencer suitable to be placed at an inlet and / or outlet of an air conditioning unit 100, the silencer comprising a first flow restrictor 210 spaced from a second air flow restrictor 220 by a gap 230 and are arranged to create a non-linear air flow, and wherein the first and second flow restrictors are formed from sound absorbing material. The flow restrictors may be plates that extend across an air ducting and include equal sized apertures (fig 4) allowing air to pass therethrough. A third air flow restrictor 330 may be used. The silencer may be integral of a new air conditioning unit or may be retro fitted to existing air conditioning units, in particular having a reduced size and in use with individual hotel rooms. The apertures may be circular or other shapes and corresponding apertures in each restrictor do not substantially overlap, i.e. less than 30% overlap. The restrictors may be formed from acoustic foam having a thickness greater than 0.02m. A method of silencing and a vent grill 400 for use with an air conditioning system is also claimed.