14_1/2x19x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Monitors & Timers These microscopic fungi attach to

These microscopic fungi attach to and colonize the root systems working in symbiosis with plants

No more waste

Grow More Mendocino Micro 5-0-1*

so you stay comfortable over long hours

and fruit set

14_1/2x19x1 Exact MERV 13 Plus Carbon AC Furnace Filters 6 Pack Monitors & Timers These microscopic fungi attach toNordic Pure Custom MERV 13 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