20x22_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack harvest-solution Up to 4 hours of

Up to 4 hours of use on a single charge

THIS UNIT REQUIRES A VACUUM PUMP AND NITROGEN TANK WITH REGULATOR TO FUNCTION

favored by thousands of horticulturists—but with the added feature of curved blade tips

Storage: Stable in freezing and adverse environmental conditions

health and production by reconnecting container-grown plants to the Earth's energy

20x22_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack harvest-solution Up to 4 hours ofNordic 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