17_1/2x23_1/2x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Chemicals Comes in a bottle designed

Comes in a bottle designed to keep air and light from damaging the solution

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

- Up to 20% more available light

It has important roles in the formation of new leaves

The gridded surface and bright color allow for easy monitoring

17_1/2x23_1/2x1 MERV 14 Plus Carbon AC Furnace Filters 6 Pack Chemicals Comes in a bottle designedNordic 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