17_1/4x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack light In-line pH

In-line pH

The compact design with a built-in driver balances the energy efficiency and human work environment

healthier plants with bountiful yields

ARS Cultivation scissors are the go-to choice for harvesting

17_1/4x23_1/4x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack light In-line pHNordic 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