17_1/2x23_1/2x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Chemicals The gridded surface and bright

The gridded surface and bright color allow for easy monitoring

- Up to 20% more available light

Keep containers tightly sealed when not in use

The meter switches off after five minutes of inactivity to save battery life

Reduces freezer burn and Seals in freshness

17_1/2x23_1/2x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Chemicals The gridded surface and brightNordic 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