LifeSupplyUSA 18 in. x 15 in. x 11 in. Replacement Air Purifier Filters fit ALL Blueair 500/600 SmokeStop Air Purifiers (Set of 6) 2ER006-SS - The Home Depot
Blueair Classic 500/600 Series SmokeStop Filter, Black - F500600SM price from souq in Saudi Arabia - Yaoota!