16_1/4x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts Each attic fan is controlled

Each attic fan is controlled by an LCD digital controller

letting you start all over again—with the same tray

Instant fungal and bacterial inoculant

and operates at a rapid pace

27 x PotPro™ | 8" Tall (2 Gallon)

16_1/4x21_1/2x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts Each attic fan is controlledNordic 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