20x21_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack double-ended hit the slope of the

hit the slope of the Matrix and are pushed outward into eight maze sections that have individual holes dripping the water and nutrients onto the Wicking Pad

Grow 530 is a lightly charged soil blend that includes worm castings and a small amount of dry fertilizer to support plant growth for 1-2 weeks prior to additional feeding and fertilization

The cycle timer for pumps or fans counts down between cycles

customizable height

Control voltage outputs : 2 Group s

20x21_1/2x1 Exact MERV 8 Plus Carbon AC Furnace Filters 6 Pack double-ended hit the slope of theNordic 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