11_1/2x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack house and amp Width: 19½" - Height: 18¾"

Width: 19½" - Height: 18¾" - Length: 30⅛"

G-Rex is formulated to be used throughout the entire growth cycle

3-micron size limitations

Wattage control: 600/750/825/1

growers will experience an optimal air to water ratio

11_1/2x21x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack house and amp Width: 19½" - Height: 18¾"Nordic 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