17_1/4x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Synthetic Pro Edition Contains natural pyrethrins widely used

Contains natural pyrethrins widely used in organic growing because of its rapid breakdown

Potato Leafhopper (Empoasca fabae)

- Countless Trials Indicate Dramatic Increase in Terpenes & Resin

enhancing the performance of the lamp and maximizing plant quality and yield

made from high quality TFC sheets—tested and proven to be the best material available for membrane applications

17_1/4x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Synthetic Pro Edition Contains natural pyrethrins widely usedNordic Pure Custom MERV 13 Plus Carbon air filters are made based on the actual measurements so be sure to measure your current filter to get the EXACT dimensions before ordering. As with all Nordic Pure filters, the effective life of your filter depends on the environment in which you live. We recommend changing 1 and 2 filters every 30 90 days. Our 4, 5 and 6 inch thick filters could last up to 6 months. EXACT MEASUREMENT: Furnace and air condition