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Get premium quality 18x24x4 furnace filters made by CAMFIL. Compare Camfil filters:
MERV 8 8 11 13
LIFESPAN 4 months 6 months 5 months 5 months
COST PER FILTER $20.83 $30
$24.67 $35
$180 $148 $210
 OVERVIEW  economical  best overall
 remove allergens
at low cost
 superior dust and
allergen removal
The higher the MERV rating on a filter, the fewer dust particles and other contaminants can pass through it. 
  • 18x24x4 Furnace Filter

    18x24x4 Furnace Filter Camfil AP-3. (6-pack) $129.00 $125.00

    MERV 8 yields high indoor air quality with an exceptional filter that rivals the brand name competition. GREAT VALUE: You pay only $20.83 each! Pay less, get more. Most affordable product of this size! HIGHLIGHTS MERV 8...

  • 18x24x4 Furnace Filter Merv 8

    18x24x4 Furnace Filter Camfil 30/30. (6-pack) $185.00 $180.00

    MERV 8: Best selling -- 5 Star Rated with Innovative Technology. Ultimate filter for Canadian homeowners. Offers the best value for price, lifespan, and air quality with brand name reliability. Pay only $30 per filter! This...

  • 18x24x4 furnace filter merv 11

    18x24x4 Furnace Filter Camfil AP-11. (6-pack) $170.00 $148.00

    MERV 11: High Efficiency -- State of the art filtration capabilities remove allergens, the perfect choice for Canadian homeowners to elevate air quality. Brand name reliability at a low cost: pay only $24.67 per furnace...

  • 18x24x4 Air Filter Merv 13

    18x24x4 Furnace Filter Camfil AP-13. (6-pack) $215.00 $210.00

    MERV 13: Highest Efficiency filtration. The BEST Canadian homeowners can buy! Better performance, superior results for a cleaner, safer home. And at just $35 per filter, you’re paying for superior dust and allergen...