17_1/2x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack new_additions Sourced from established and reputable

Sourced from established and reputable farms

• Smooth or step speed control with external thyristor or autotransformer speed controller

Nature's Solution Ancient Humate is a concentrated liquid amendment for plants and soil from an ancient bog

The botanical extracts are all food grade GRAS (generally recognized as safe) materials that are fully biodegradable and not toxic to animals

with a 7mm upward lip

17_1/2x23_1/2x1 MERV 13 Plus Carbon AC Furnace Filters 6 Pack new_additions Sourced from established and reputableNordic 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