20x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_jondon Each paper is watermarked with

Each paper is watermarked with our patented Criss-Cross watermark

and service reminders

All LTL Controls CO2 Generators are available in High/Low Altitude and Natural Gas/Propane options

Water cooling feature removes 86% of the heat produced

20x21_1/2x1 Exact MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_jondon Each paper is watermarked withNordic Pure Custom MERV 10 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