HFT600 Humidifier Wicking Filter T Replcement for Honeywell HEV615 HEV620 Series Top Fill Tower Humidifier, Compared to Part HFT600T HFT600PDQ Wicking Filter, 4 Pack, Blue Reinforced Mesh Paper Compatible Models - Our HFT600 humidifier filter compatible with Honeywell HEV615 series and HEV620 series humidifier filter. Replacement for filter type T and HFT600 filter Super Craftsmanship - Our HFT600 humidifier filter with hot glue strips and dense construction, are made of high quality reinforced mesh paper, and are rich in high density hygroscopic fibers that prevent collapsing or sagging due to time or moisture. In addition, the use of advanced low-density structure technology, with higher filtration accuracy, effectively reduce the accumulation of dirt and remove impurities such as particles, helping to reduce or even eliminate potential health risks Ideal humidity levels - Our blue upgraded HFT600 humidifier filter has a blue pre-filter layer, which can successfully capture large particles and quickly help the humidifier to increase indoor humidity on top of further purifying water quality and resolve a range of symptoms caused by low humidity: ①Prevent or relieve dry skin, help reduce nasal swelling and make it easier for you to breathe; ②Help reduce static electricity ③Help keep the things you own in good condition Great Value Pack - Package includes 4 x HFT600 humidifier filters. Filter Dimensions: H: 7.68” x L: 6.3” x W: 1.37” (Please refer to the picture for details). Warm Tips: For best results, please fill the humidifier tank with distilled water. Excessive use of hard water will degrade filters and cause them to turn yellow prematurely. We recommend you to replace the humidifier filter every 1-2 months for optimal performance (depending upon your usage)