23x25x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack house and garden soil PPF Output by Spectrum: PhysioSpec

PPF Output by Spectrum: PhysioSpec Indoor: 190 μmol/s

multiple sources of nitrogen and fully chelated micronutrients

The reels on these machines are 5” in diameter and 21″ in length

Nordic Pure 24x24x2 MERV 10 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

Reduce heat stress and improve air quality with Schaefer's uniquely designed circulation fans

23x25x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack house and garden soil PPF Output by Spectrum: PhysioSpecNordic Pure Custom MERV 14 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