Includes all filters for the HP500 HEPA Air Cleaner. 2 x Pre-Filters/Carbon Filter Combination (replace one every six months) ARK564 1 x HEPA filter (replace one every two years) RHF562 Both filters are the original equipment manufacturer replacement filters for use in the PremierOne HP500 and GeneralAire AC500 HF500, 4620, 4645 HEPA air cleaner.

NOT A CHEAP KNOCK OFF MERV 15
GENERALAIRE 4620 HF500 HEPA REPLACEMENT FILTER FOR AC500 PREMIERONE RHF562 HEPA FILTER FOR HP500
TRUE HEPA AIR CLEANER
Also for the following:
GeneralAire HF500 400D 400R 4645 4620 HP-300 HEPA Filter for AC500
HEPA filter (3rd stage), 11‐1/2" x 15‐1/2" x 2‐1/2". 
Also Fits Coleman S1‐HEPA300; Generalaire AC500; Greentek HS 3.0; Imperial 300T, HS 3.0, IFB6; Luxaire S1‐HEPA300; Premier One HEPA 500, HP500; Sanuvox S300FX‐GX, S300HFX; Source1 S1‐HEPA300; York S1‐HEPA300
Replace filters every 2 years