28x34x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Light Movers Hangers and Ferrous Sulfate

and Ferrous Sulfate

White lid reflects light to minimize heat build up

These new air cleanliness guidelines include two major changes:

Balanced NPK and essential microelements (when used with Pro Core)

28x34x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack Light Movers Hangers and Ferrous SulfateNordic Pure Custom MERV 13 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