How often should a HEPA filter be replaced?

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Chiks

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Last year, I started wondering how often the HEPA filter in my car should be replaced. I checked the manual and a few online resources, but I couldn’t find a clear answer. Some people said it should be swapped out annually, but there wasn’t anything official. If anyone has experience or knows the ideal schedule, I’d love to know!
 
Thanks for the clarification. Since the manual suggests every two years for regular use and annually for off-road driving, I think I'll stick with changing mine once a year for better air quality
 
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