archivelogs scheduling

I inherited a system that I only want for there to be 7 days of archivelogs 
kept on the server.    The rest should be backed up and removed by RMAN.     
Right now there seems to be several weeks worth of archivelogs and I am not 
sure what the schedule is for them.   I looked at the script and it doesn't 
seem to indicate how the logs are being removed or what the settings are.   
Where else should I look?   Is there a parameter that needs to be alter to be 7 
instead?

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