21x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack water-pumps-&-irrigation-supplies This film's high durability makes

This film's high durability makes it reusable and easy to clean

Suitable to pump clear water containing particles with maximum diameter up to 1/4 in

Key features include:

one side black (Black/Clear)

21x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack water-pumps-&-irrigation-supplies This film's high durability makesNordic 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