28x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts and will display the CO2

and will display the CO2 ppm level

The Bubble Magic Tumblers feature a 145 micron screen standard

and Enzyme Blend

Gard’nClean GC Liquid is not a skin irritant

making it ideal for shelves or stacked storage

28x28x1 MERV 12 Plus Carbon AC Furnace Filters 6 Pack Grow Light Ballasts and will display the CO2Nordic 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