23_1/2x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hf and size options

and size options

CO2 and more

This helps to deter misuse and abuse of the product

Teas and Brews: Add 1 tsp of concentrate per liquid gallon of tea/brew

23_1/2x23_1/2x1 MERV 10 Plus Carbon AC Furnace Filters 6 Pack spl_hf and size optionsNordic 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