16x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack pots-containers The TRS21 Active Closed Loop

The TRS21 Active Closed Loop Recovery Kit is an upgrade kit that can be added to our passive systems to make it active

Z7 is not like any other product offered in the horticultural market today

Reinforced with a deep sidewall (7¾" ID

The blend is formulated with triple washed coco coir to guarantee low salts

16x36x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack pots-containers The TRS21 Active Closed LoopNordic 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