17x25x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts 5’ flowering coverage at 14”

5’ flowering coverage at 14”

Ultra high frequency operation

- 600w Metal halide bulb

Two-pole amperometric probe

17x25x1 MERV 8 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts 5’ flowering coverage at 14”Nordic 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