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

Plants use amino acids to build molecules that protect them from environmental stresses and pest attacks

The croutons' water holding capacity is similar to clay pellets

Reinforced with a deep sidewall (7¾" ID

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