30x30x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack plant-support The yellow LED indicator shows

The yellow LED indicator shows CO2 level equal or above 800ppm which means supplemental CO2 is in use

Chinch Bugs (Blissidae)

The sealed motor and removable

This Product Controls These Pests or Diseases: OxiPhos is effective against Pythium

30x30x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack plant-support The yellow LED indicator showsNordic Pure Custom MERV 12 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