17x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack ventilation a calcium additive

a calcium additive

greenhouses and storage sites

larval and adult stages of targeted insects while preventing fungal attacks

11 years of lighting manufacturing experience allow us to supply a product of well-built quality at a reasonable price

thrips (Thysanoptera)

17x27x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack ventilation a calcium additiveNordic Pure Custom MERV 7 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