The VMD1-0002 Vornado ReplacementBrand Comparable Wick Filter is designed to remove particles and other impurities from water before humid air is dispersed into the room. The VMD1-0002 work's best in absorbing the maximum amount of water in your evaporative humidifier. Replace this humidifier filter every two months, or depending on uses for best results. This product comes with a high-quality filter media that ensures the humidifier performs effectively for cleaner, fresher and healthier air in your home. Order by 4pm CST for same day shipping!