213 MERV 13 Replacement Media for Aprilaire 213 Filter (2-Pack)
This filter is a brand new genuine Aprilaire 213 air filter for the Aprilaire 2200, 2210 and 4200 Media Air Cleaners.  Aprilaire recommends this filter be replaced every 6 months for maximum efficiency and effectiveness. Much of this depends on the condition of the environment it is servicing.