20x20x4

20x20x4 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 $21.67
 $30.67
 $31.83
 $49
PRICE 6-PACK $130
 $184 $191
 $294
 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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