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Sort By: Price: Low to High Price: High to Low Most Popular Title Manufacturer Newest Oldest Availability 30 per page 60 per page 120 per page 180 per page 300 per page Page of 1 Best Air 401 Filter Our Price: $35.75 Lennox x0444 MERV 10 Expandable Filter Our Price: $50.00 (2) Best Air 401 Expandable Filter Merv 11 Lennox Healthy Climate x0444 Expandable Filter Nominal Expanded Size: 16" x 27" x 6" Exact Collapsed Size: 3" x 26.5" x 6.125" Filter Rating: MERV 10 Expected Duration: 6 to 12 months