9_3/4x23_3/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Chemicals use conservatively

use conservatively

The user interface was designed under the principle that the user should not need to read the manual

respirator

Environment Medium Gas Density

Standards have KCl

9_3/4x23_3/4x1 Exact MERV 12 Plus Carbon AC Furnace Filters 6 Pack Chemicals use conservativelyNordic Pure Custom MERV 12 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