7_3/4x25_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack light It features four-layer protection

It features four-layer protection

The Original Can Filters® are designed for the control of VOCs (paint fumes

maximize root growth and increase plant yield

Please Note: The AS-2 requires the SPH-1 for supplemental power

The optimal pH for plant growth is between 5

7_3/4x25_3/4x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack light It features four-layer protectionNordic Pure Custom MERV 7 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