28x32x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Plant Care/Pest & Disease Control 5% (w/v) Metric: 1-5g/L US

5% (w/v) Metric: 1-5g/L US equivalent (approx

- 10' x 20' Size

especially when bound in high pH soils

Yield Consistency

and automatic calibration

28x32x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Plant Care/Pest & Disease Control 5% (w/v) Metric: 1-5g/L USNordic Pure Custom MERV 8 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