16_3/8x21_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack X Nutrients • High aerodynamic efficiency

• High aerodynamic efficiency

Slide lock door gives easy access to inner chamber while soft neoprene layer creates dust-free seal

- Suitable for most crops – fruit/nut trees

No Refrigeration Needed – Stable at room temperature for up to 12 months

16_3/8x21_3/8x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack X Nutrients • High aerodynamic efficiencyNordic 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