20x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack special-order These professionally formulated nutrients provide

These professionally formulated nutrients provide high performance ingredients in a simple to use program

please specify those dates in the Special Instructions/Comments box during checkout

Derived from a natural source

Stem Mildew

unless the infestation is extreme

20x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack special-order These professionally formulated nutrients provideNordic 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