16x21_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack drying-racks Total Grow Control pH-EC Controller

Total Grow Control pH-EC Controller

this cover works to protect the tumbler from outside material

CE certified

Using Bloom Natural in conjunction with Grow Natural

16x21_1/2x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack drying-racks Total Grow Control pH-EC ControllerNordic 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