20x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack beneficial microbes • Remains stable over the

• Remains stable over the planting cycle

Chemboys Humic Liquid improves plant immunity

Double the Sites = Twice the Profit

• Exhaust

per pack:                       0

20x23x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack beneficial microbes • Remains stable over theNordic 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