18x24x4

18x24x4 furnace filter. Premium quality made by CAMFIL.
  CAMFIL AP-3 CAMFIL 30/30 CAMFIL AP-11 CAMFIL AP-13
MERV 8 8 11 13
LIFESPAN 4 months 6 months 5 months 5 months
COST PER FILTER $20.83 $30
$24.67 $35
PRICE 6-PACK $125
$180 $148 $210
 OVERVIEW  economical  best overall
value
 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. 

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  • 18x24x4 furnace filter MERV 11

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

    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 filter! Most popular option for...

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  • 18x24x4 Air Filter Merv 13

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

    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 removal without the name brand...

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