How often should I change my Aprilaire air cleaner filter?

Consumer question:

I just upgraded to your 413 filter. Was using the 401. I changed my old 401 every 18 months. Wondering if that’s still a good interval. Longer? Shorter? Check it at 1 year? The 401’s were dirty, not filthy by any means, when I changed them. Our house is pretty tight. Thanks.

Aprilaires’ response:

Typically we have found that when moving from the 401 to the 413 that consumers will need to change the 413 at about the same interval that the 401 was changed.

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