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There will be a filter that can be brushed/vacuumed and washed
They are easily removed by definition, however without the Make and Model, it is difficult to tell you precisely
Look for a large fluted panel... behind will be a spun fibre mesh and or fly wire looking screen... remove, vac or wipe/brush, then wash under warm water and dry thoroughly before reinstalling
If you have the model details I may be able to give a better clue... do you have the manual handy ?