21_1/4x21_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack AIR FILTER BOXES • Plays major part in

• Plays major part in stem and leaf growth

see label and other online resources for details

It eliminates deficiencies and harmful salt build up

or interfere with your nutrient solution

The flanges can also be reversed to prolong the life of the filter

21_1/4x21_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack AIR FILTER BOXES • Plays major part inNordic 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