25x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack stocked easy to combine*

easy to combine*

2-Channel Low Drift NDIR Sensor precisely reads CO2 ppm levels

Adding more of THE GRAND DADDY PADS will increase your PPM's in your specific area

High intensity output provide higher crop yields and brings more advantages than traditional hid light sources

25x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack stocked easy to combine*Nordic 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