14x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_hw Product Includes:

Product Includes:

We recommend changing your HVAC furnace filter every 2-6 months

Floralife® Transport Paper is impregnated with compounds that react when exposed to relative humidity above 40%

- 98% reflective

The 25u offers smaller holes and gives you a more filtered and refined product where the 150u has larger holes that allows material to pass through easier and can potentially provide slightly higher yields

14x18x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack spl_hw Product Includes:Nordic 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