21x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack water-pumps-&-irrigation-supplies Key features include:

Key features include:

Input voltage - DC12V

Use beneficial nematodes to kill active maggots in and around manure piles

Actual lifespan will vary depending on your water quality and usage volume

21x21x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack water-pumps-&-irrigation-supplies Key features include:Nordic 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