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Derived from a natural source
unless the infestation is extreme
Enhances plant functions at the foliar level and the root zone in both soil and soilless substrates
please specify those dates in the Special Instructions/Comments box during checkout
20x28x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack special-order Derived from a natural sourceNordic 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
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