Replacement Vornado MD1-0001 Humidifier Filter - Quantity, 5 Replaces Vornado MD1-0002, MD1-0001 Air Filter Traps Fluid 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. Replacement Vornado MD1-0001 Humidifier Filter - Quantity, 5 Replaces Vornado MD1-0002, MD1-0001 Air Filter Traps Liquid 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.
