I've ran a double filter system a long time back but you need to use twice the size filter you'd normally use for the fan size not to restrict the air flow and to make sure the fan isn't over working . If you're filter has a space inside it . It hasn't been filled properly and more than likely is a cheapo filter and you should have got a rhino and if it's a rhino or another high end filter you should have returned it . They are normally filled under vacuum and on a vibrating bed to make sure they is no gaps
sent from mission control
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