12_3/4x20_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack cleanroom and the 2 1/4" Matrix

and the 2 1/4" Matrix Circulator

• Increases insect and fungi resistance

If you can work a television

Listed diameter is measured from the inside of the bottom of the saucer

and are immediately ready to use by a grower upon receipt

12_3/4x20_3/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack cleanroom and the 2 1/4" MatrixNordic 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