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 $25.50 $36.33
$32.33
$38.83
PRICE 6-PACK $153
$218
$194 $233
 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 Camfil AP-11. (6-pack)

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

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