16_3/8x21_3/8x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack water-filtration Can be used from seed

Can be used from seed through post-harvest

Harlequin Bugs

Minimum Order of 1 case (4 Units)

or as frequently as every watering

16_3/8x21_3/8x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack water-filtration Can be used from seedNordic 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