17x25x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts Ultra high frequency operation

Ultra high frequency operation

| 1 lb per 4

CONSTRUCTION: Custom air filters are made by cutting down or combining 1

stimulating dense

Reinforced with a deep

17x25x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts Ultra high frequency operationNordic 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