UpStart Battery 3-Pack Replacement Sunbeam 1118 Humidifier Filter - Compatible Sunbeam WF2 Air Filter Replacement Sunbeam 1118 Humidifier Filter - Quantity, 3 Replaces Sunbeam WF2 Air Filter Traps Water Impurities & Dissolved Solids Before They Become Airborne For best results, change air filter at least once per season or more often depending on air quality and use. Essential for Allergy Sufferers. On Sale for a Limited Time!