21_1/4x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Emitters 5A maximum load

5A maximum load

The little holes on the inside of the cartridge vary in size and quantity depending on the type of cartridge and oil that will be used

air fluidity and great heat dissipation

The Hydroponic Research Growth Chamber is a unique

some growers place the spray stake near the edge of the pot

21_1/4x23_1/4x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Emitters 5A maximum loadNordic Pure Custom MERV 14 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