17x29x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Growing Accessories A high nitrogen

A high nitrogen

The TDS probe is easy to clean and requires little maintenance

This mask covers the mouth

Operates safely without high voltage

17x29x1 Exact MERV 14 Plus Carbon AC Furnace Filters 6 Pack Growing Accessories A high nitrogenNordic Pure Custom MERV 14 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