17x29x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_fluence Each container includes 2

Each container includes 2

These unique compounds are absorbed immediately and act as regulatory signals

Reapply on a regular schedule as directed on the label

soil conditions

Mix colonized grain and substrate in a monotub or grow bag

17x29x1 Exact MERV 7 Plus Carbon AC Furnace Filters 6 Pack spl_fluence Each container includes 2Nordic Pure Custom MERV 7 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