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Merv8 and Merv11 - we recommend replacing them every 90 days to ensure the quality of your air stays clean and unit functions properly.
Merv13 - we recommend replacing them at least once a year to ensure the quality of your air stays clean and unit functions properly.
The above depends on the environment: smoking, pets, etc.

We also do custom sizes - Just fill in the information in the "Contact Us" section, and we will provide the pricing, usually within 24 hours.