Photo 1 of *One Opened* Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 413, 4PK

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Photo 1 of *One Opened* Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 413, 4PKPhoto 2 of *One Opened* Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 413, 4PKPhoto 3 of *One Opened* Aerostar MERV 13 Collapsible Replacement Filter for Aprilaire 413, 4PK