15x19x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-system/-trays/-reservoirs Weight - 3

Weight - 3

*BIOFUNGICIDE is only available in the USA

Introduce green lacewing at the first sign of pest infestation for best results

humic acids derived from leonardite and peat

favored by thousands of horticulturists

15x19x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack grow-system/-trays/-reservoirs Weight - 3Nordic Pure Custom MERV 13 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