16" x 28" Flex Filter for Aprilaire 401 (FLEX-7)46600404 16" x 28" Flex Filter for Aprilaire 401 (FLEX-7)
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- Replaces major brands
- Installs in seconds
- MERV 11 media
- Easy to store
- Aprilaire  16" x 28" x 4" Filter
16" x 28" x 4"
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