Camfil 18x25x1 Furnace Filter Merv 13 (12-pack) MERV 13: Highest Efficiency filtration. The BEST Canadian homeowners can buy! Better performance, superior results for a cleaner, safer home. And at just $22 per filter, you’re paying for superior dust and allergen removal without the name brand... MSRP: Was: $290.00 Now: $264.00 Add to Cart