20x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl_fltrbuy but residual pentane is not

but residual pentane is not a major concern as long as the oil is purged thoroughly

150 Liters (40 Gal) Tank Capacity

Always use equal parts of Athena Grow A & B to maintain proper mineral ratios

13-inch overall length

| Airflow: 160 CFM | Noise: 28 Dba | Bearings: Dual Ball

20x21_1/2x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack spl_fltrbuy but residual pentane is notNordic Pure Custom MERV 12 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