17_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack bio-organic fertilizer Easy on the eyes

Easy on the eyes

The number of units and the size of the ionization tubes are dependent upon the airflow in the system and the severity of the pollution problem

• Cooling fins for maximum heat dissipation

Cotton Leafworm

The 440C stainless steel blade contains more carbon for excellent hardness and edge retention

17_1/2x21x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack bio-organic fertilizer Easy on the eyesNordic 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