21x23_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients Suggested Uses: For use on

Suggested Uses: For use on horticultural plants

Safe to use around bees

Designed for controlled environment horticulture applications requiring efficient

Nordic Pure 14x20x1 MERV 10 Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

21x23_1/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack flowering nutrients Suggested Uses: For use onNordic Pure Custom MERV 7 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