Economic Price Airvention HF1715 Replacement Filter Set 2 HEPA Filter and 2 Pre-filter, Compatible with Hunter HT1715

Compatible with Hunter F1715HE/21 Fits Hunter HT1715 Air Purifiers.
The Pre-filter and HEPA filter work together to block out as much as 99% of airborne particles as little as 0.3 microns, such as dust, pollen, smoke & various allergens.
Pre-filter should be changed every 3 months.
HEPA filter changed every 12-18 months.