15x17x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Growing Media * Quiet Operation

* Quiet Operation

- Trim up to 7 units/hr

Chemboys PH Down Max is the most potent and cost-effective ph Up solution available on the market today

LED chipset: 102pcs 5000k+104pcs 3000K+6pcs 660nm+2pcs 740nm+4pcs 395nm

The most advanced economically priced

15x17x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Growing Media * Quiet OperationNordic 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