16_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Extension They feed on and control

They feed on and control all stages of phytophagous mites with all mobile life stages of A

greenhouse planting and hydroponics etc

Outputs over 2700 µmol/s of plant biologically active radiation (PBAR 280-800nm) when operated on 1150W as verified by independent laboratory testing

one must ensure that the Ca and Mg you are feeding your garden is derived from high quality source materials

16_1/2x21x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Extension They feed on and controlNordic Pure Custom MERV 12 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