Camfil 16x25x1 Furnace Filter Merv 11. (12-Pack) 16×25×1 Camfil AP-11 — High-Efficiency MERV 11 Filter MERV 11 — High Efficiency. State-of-the-art filtration removes allergens and fine particles, making it the perfect choice for Canadian homeowners who want to improve... MSRP: Was: $185.00 Now: $156.00 Add to Cart